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.\" ========================================================================
.\"
.IX Title "FEEDGNUPLOT 1"
.TH FEEDGNUPLOT 1 "2016-11-25" "perl v5.22.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
feedgnuplot \- General purpose pipe\-oriented plotting tool
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
Simple plotting of piped data:
.PP
.Vb 6
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq
\& 2 1
\& 4 4
\& 6 9
\& 8 16
\& 10 25
\&
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq |
\&   feedgnuplot \-\-lines \-\-points \-\-legend 0 "data 0" \-\-title "Test plot" \-\-y2 1
\&               \-\-terminal \*(Aqdumb 80,40\*(Aq \-\-exit
\&
\&                                  Test plot
\&
\&  10 ++\-\-\-\-\-\-+\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-*A 25
\&     +       +        +       +       +       +        +       +    **#+
\&     |       :        :       :       :       :        : data 0+**A*** |
\&     |       :        :       :       :       :        :       :** #   |
\&   9 ++.......................................................**.##....|
\&     |       :        :       :       :       :        :    ** :#      |
\&     |       :        :       :       :       :        :  **   #       |
\&     |       :        :       :       :       :        :**   ##:      ++ 20
\&   8 ++................................................A....#..........|
\&     |       :        :       :       :       :      **:   #   :       |
\&     |       :        :       :       :       :    **  : ##    :       |
\&     |       :        :       :       :       :  **    :#      :       |
\&     |       :        :       :       :       :**      B       :       |
\&   7 ++......................................**......##................|
\&     |       :        :       :       :    ** :    ##  :       :      ++ 15
\&     |       :        :       :       :  **   :   #    :       :       |
\&     |       :        :       :       :**     : ##     :       :       |
\&   6 ++..............................*A.......##.......................|
\&     |       :        :       :    ** :     ##:        :       :       |
\&     |       :        :       :  **   :    #  :        :       :       |
\&     |       :        :       :**     :  ##   :        :       :      ++ 10
\&   5 ++......................**........##..............................|
\&     |       :        :    ** :      #B       :        :       :       |
\&     |       :        :  **   :    ## :       :        :       :       |
\&     |       :        :**     :  ##   :       :        :       :       |
\&   4 ++...............A.......###......................................|
\&     |       :      **:     ##:       :       :        :       :       |
\&     |       :    **  :   ##  :       :       :        :       :      ++ 5
\&     |       :  **    : ##    :       :       :        :       :       |
\&     |       :**    ##B#      :       :       :        :       :       |
\&   3 ++.....**..####...................................................|
\&     |    **####      :       :       :       :        :       :       |
\&     |  **## :        :       :       :       :        :       :       |
\&     B**     +        +       +       +       +        +       +       +
\&   2 A+\-\-\-\-\-\-+\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-++ 0
\&     1      1.5       2      2.5      3      3.5       4      4.5      5
.Ve
.PP
Simple real-time plotting example: plot how much data is received on the wlan0
network interface in bytes/second (uses bash, awk and Linux):
.PP
.Vb 3
\& $ while true; do sleep 1; cat /proc/net/dev; done |
\&   gawk \*(Aq/wlan0/ {if(b) {print $2\-b; fflush()} b=$2}\*(Aq |
\&   feedgnuplot \-\-lines \-\-stream \-\-xlen 10 \-\-ylabel \*(AqBytes/sec\*(Aq \-\-xlabel seconds
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a flexible, command-line-oriented frontend to Gnuplot. It creates
plots from data coming in on \s-1STDIN\s0 or given in a filename passed on the
commandline. Various data representations are supported, as is hardcopy
output and streaming display of live data. A simple example:
.PP
.Vb 1
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq | feedgnuplot
.Ve
.PP
You should see a plot with two curves. The \f(CW\*(C`awk\*(C'\fR command generates some data to
plot and the \f(CW\*(C`feedgnuplot\*(C'\fR reads it in from \s-1STDIN\s0 and generates the plot. The
\&\f(CW\*(C`awk\*(C'\fR invocation is just an example; more interesting things would be plotted
in normal usage. No commandline-options are required for the most basic
plotting. Input parsing is flexible; every line need not have the same number of
points. New curves will be created as needed.
.PP
The most commonly used functionality of gnuplot is supported directly by the
script. Anything not directly supported can still be done with options such as
\&\f(CW\*(C`\-\-set\*(C'\fR, \f(CW\*(C`\-\-extracmds\*(C'\fR \f(CW\*(C`\-\-style\*(C'\fR, etc. Arbitrary gnuplot commands can be
passed in with \f(CW\*(C`\-\-extracmds\*(C'\fR. For example, to turn off the grid, you can pass
in \f(CW\*(C`\-\-extracmds \*(Aqunset grid\*(Aq\*(C'\fR. Commands \f(CW\*(C`\-\-set\*(C'\fR and \f(CW\*(C`\-\-unset\*(C'\fR exists to
provide nicer syntax, so this is equivalent to passing \f(CW\*(C`\-\-unset grid\*(C'\fR. As many
of these options as needed can be passed in. To add arbitrary curve styles, use
\&\f(CW\*(C`\-\-style curveID extrastyle\*(C'\fR. Pass these more than once to affect more than one
curve.
.PP
To apply an extra style to \fIall\fR the curves that lack an explicit \f(CW\*(C`\-\-style\*(C'\fR,
pass in \f(CW\*(C`\-\-styleall extrastyle\*(C'\fR. In the most common case, the extra style is
\&\f(CW\*(C`with something\*(C'\fR. To support this more simply, you can pass in \f(CW\*(C`\-\-with
something\*(C'\fR instead of \f(CW\*(C`\-\-styleall \*(Aqwith something\*(Aq\*(C'\fR. \f(CW\*(C`\-\-styleall\*(C'\fR and
\&\f(CW\*(C`\-\-with\*(C'\fR are mutually exclusive. Furthermore any curve-specific \f(CW\*(C`\-\-style\*(C'\fR
overrides the global \f(CW\*(C`\-\-styleall\*(C'\fR or \f(CW\*(C`\-\-with\*(C'\fR setting.
.SS "Data formats"
.IX Subsection "Data formats"
By default, each value present in the incoming data represents a distinct data
point, as demonstrated in the original example above (we had 10 numbers in the
input and 10 points in the plot). If requested, the script supports more
sophisticated interpretation of input data
.PP
\fIDomain selection\fR
.IX Subsection "Domain selection"
.PP
If \f(CW\*(C`\-\-domain\*(C'\fR is passed in, the first value on each line of input is
interpreted as the \fIX\fR\-value for the rest of the data on that line. Without
\&\f(CW\*(C`\-\-domain\*(C'\fR the \fIX\fR\-value is the line number, and the first value on a line is
a plain data point like the others. Default is \f(CW\*(C`\-\-nodomain\*(C'\fR. Thus the original
example above produces 2 curves, with \fB1,2,3,4,5\fR as the \fIX\fR\-values. If we run
the same command with \f(CW\*(C`\-\-domain\*(C'\fR:
.PP
.Vb 1
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq | feedgnuplot \-\-domain
.Ve
.PP
we get only 1 curve, with \fB2,4,6,8,10\fR as the \fIX\fR\-values. As many points as
desired can appear on a single line, but all points on a line are associated
with the \fIX\fR\-value at the start of that line.
.PP
\fICurve indexing\fR
.IX Subsection "Curve indexing"
.PP
By default, each column represents a separate curve. This is fine unless sparse
data is to be plotted. With the \f(CW\*(C`\-\-dataid\*(C'\fR option, each point is represented by
2 values: a string identifying the curve, and the value itself. If we add
\&\f(CW\*(C`\-\-dataid\*(C'\fR to the original example:
.PP
.Vb 1
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq | feedgnuplot \-\-dataid \-\-autolegend
.Ve
.PP
we get 5 different curves with one point in each. The first column, as produced
by \f(CW\*(C`awk\*(C'\fR, is \fB2,4,6,8,10\fR. These are interpreted as the IDs of the curves to
be plotted. The \f(CW\*(C`\-\-autolegend\*(C'\fR option adds a legend using the given IDs to
label the curves. The IDs need not be numbers; generic strings are accepted. As
many points as desired can appear on a single line. \f(CW\*(C`\-\-domain\*(C'\fR can be used in
conjunction with \f(CW\*(C`\-\-dataid\*(C'\fR.
.PP
\fIMulti-value style support\fR
.IX Subsection "Multi-value style support"
.PP
Depending on how gnuplot is plotting the data, more than one value may be needed
to represent the range of a single point. Basic 2D plots have 2 numbers
representing each point: 1 domain and 1 range. But if plotting with
\&\f(CW\*(C`\-\-circles\*(C'\fR, for instance, then there's an extra range value: the radius. A
similar situation exists with \f(CW\*(C`\-\-colormap\*(C'\fR where each point contains the
position \fIand\fR the color. There are other gnuplot styles that require more data
(such as error bars), but none of these are directly supported by the script.
They can still be used, however, by specifying the specific style with
\&\f(CW\*(C`\-\-style\*(C'\fR, and specifying how many values are needed for each point with
\&\f(CW\*(C`\-\-rangesizeall\*(C'\fR or \f(CW\*(C`\-\-rangesize\*(C'\fR or \f(CW\*(C`\-\-extraValuesPerPoint\*(C'\fR. Those options
that specify the range size are required \fIonly\fR for styles not explicitly
supported by feedgnuplot; supported styles do the right thing automatically.
.PP
More examples: if making a 2d plot of y error bars where gnuplot expects a
(x,y,ydelta) tuple for each point, you want \f(CW\*(C`\-\-rangesizeall 2\*(C'\fR because you have
one domain value (x) and 2 range values (y,ydelta). Gnuplot can also plot
lopsided y errorbars by giving a tuple (x,y,ylow,yhigh). This is similar as
before, but you want \f(CW\*(C`\-\-rangesizeall 3\*(C'\fR instead.
.PP
\fI3D data\fR
.IX Subsection "3D data"
.PP
To plot 3D data, pass in \f(CW\*(C`\-\-3d\*(C'\fR. \f(CW\*(C`\-\-domain\*(C'\fR \s-1MUST\s0 be given when plotting 3D
data to avoid domain ambiguity. If 3D data is being plotted, there are by
definition 2 domain values instead of one (\fIZ\fR as a function of \fIX\fR and \fIY\fR
instead of \fIY\fR as a function of \fIX\fR). Thus the first 2 values on each line are
interpreted as the domain instead of just 1. The rest of the processing happens
the same way as before.
.PP
\fITime/date data\fR
.IX Subsection "Time/date data"
.PP
If the input data domain is a time/date, this can be interpreted with
\&\f(CW\*(C`\-\-timefmt\*(C'\fR. This option takes a single argument: the format to use to parse
the data. The format is documented in 'set timefmt' in gnuplot, although the
common flags that \f(CW\*(C`strftime\*(C'\fR understands are generally supported. The backslash
sequences in the format are \fInot\fR supported, so if you want a tab, put in a tab
instead of \et. Whitespace in the format \fIis\fR supported. When this flag is
given, some other options act a little bit differently:
.IP "\(bu" 4
\&\f(CW\*(C`\-\-xlen\*(C'\fR is an \fIinteger\fR in seconds
.IP "\(bu" 4
\&\f(CW\*(C`\-\-xmin\*(C'\fR and \f(CW\*(C`\-\-xmax\*(C'\fR \fImust\fR use the format passed in to \f(CW\*(C`\-\-timefmt\*(C'\fR
.PP
Using this option changes both the way the input is parsed \fIand\fR the way the
x\-axis tics are labelled. Gnuplot tries to be intelligent in this labelling, but
it doesn't always do what the user wants. The labelling can be controlled with
the gnuplot \f(CW\*(C`set format\*(C'\fR command, which takes the same type of format string as
\&\f(CW\*(C`\-\-timefmt\*(C'\fR. Example:
.PP
.Vb 5
\& $ sar 1 \-1 |
\&   awk \*(Aq$1 ~ /..:..:../ && $8 ~/^[0\-9\e.]*$/ {print $1,$8; fflush()}\*(Aq |
\&   feedgnuplot \-\-stream \-\-domain
\&                \-\-lines \-\-timefmt \*(Aq%H:%M:%S\*(Aq
\&                \-\-set \*(Aqformat x "%H:%M:%S"\*(Aq
.Ve
.PP
This plots the 'idle' \s-1CPU\s0 consumption against time.
.PP
Note that while gnuplot supports the time/date on any axis, \fIfeedgnuplot\fR
currently supports it \fIonly\fR as the x\-axis domain. This may change in the
future.
.SS "Real-time streaming data"
.IX Subsection "Real-time streaming data"
To plot real-time data, pass in the \f(CW\*(C`\-\-stream [refreshperiod]\*(C'\fR option. Data
will then be plotted as it is received. The plot will be updated every
\&\f(CW\*(C`refreshperiod\*(C'\fR seconds. If the period isn't specified, a 1Hz refresh rate is
used. To refresh at specific intervals indicated by the data, set the
refreshperiod to 0 or to 'trigger'. The plot will then \fIonly\fR be refreshed when
a data line 'replot' is received. This 'replot' command works in both triggered
and timed modes, but in triggered mode, it's the only way to replot. Look in
\&\*(L"Special data commands\*(R" for more information.
.PP
To plot only the most recent data (instead of \fIall\fR the data), \f(CW\*(C`\-\-xlen
windowsize\*(C'\fR can be given. This will create an constantly-updating, scrolling
view of the recent past. \f(CW\*(C`windowsize\*(C'\fR should be replaced by the desired length
of the domain window to plot, in domain units (passed-in values if \f(CW\*(C`\-\-domain\*(C'\fR
or line numbers otherwise). If the domain is a time/date via \f(CW\*(C`\-\-timefmt\*(C'\fR, then
\&\f(CW\*(C`windowsize\*(C'\fR is and \fIinteger\fR in seconds.
.PP
\fISpecial data commands\fR
.IX Subsection "Special data commands"
.PP
If we are reading streaming data, the input stream can contain special commands
in addition to the raw data. Feedgnuplot looks for these at the start of every
input line. If a command is detected, the rest of the line is discarded. These
commands are
.ie n .IP """replot""" 4
.el .IP "\f(CWreplot\fR" 4
.IX Item "replot"
This command refreshes the plot right now, instead of waiting for the next
refresh time indicated by the timer. This command works in addition to the timed
refresh, as indicated by \f(CW\*(C`\-\-stream [refreshperiod]\*(C'\fR.
.ie n .IP """clear""" 4
.el .IP "\f(CWclear\fR" 4
.IX Item "clear"
This command clears out the current data in the plot. The plotting process
continues, however, to any data following the \f(CW\*(C`clear\*(C'\fR.
.ie n .IP """exit""" 4
.el .IP "\f(CWexit\fR" 4
.IX Item "exit"
This command causes feedgnuplot to exit.
.SS "Hardcopy output"
.IX Subsection "Hardcopy output"
The script is able to produce hardcopy output with \f(CW\*(C`\-\-hardcopy outputfile\*(C'\fR. The
output type can be inferred from the filename, if \fB.ps\fR, \fB.eps\fR, \fB.pdf\fR,
\&\fB.svg\fR or \fB.png\fR is requested. If any other file type is requested,
\&\f(CW\*(C`\-\-terminal\*(C'\fR \fImust\fR be passed in to tell gnuplot how to make the plot. If
\&\f(CW\*(C`\-\-terminal\*(C'\fR is passed in, then the \f(CW\*(C`\-\-hardcopy\*(C'\fR argument only provides the
output filename.
.SS "Self-plotting data files"
.IX Subsection "Self-plotting data files"
This script can be used to enable self-plotting data files. There are 2 ways of
doing this: with a shebang (#!) or with inline perl data.
.PP
\fISelf-plotting data with a #!\fR
.IX Subsection "Self-plotting data with a #!"
.PP
A self-plotting, executable data file \f(CW\*(C`data\*(C'\fR is formatted as
.PP
.Vb 10
\& $ cat data
\& #!/usr/bin/feedgnuplot \-\-lines \-\-points
\& 2 1
\& 4 4
\& 6 9
\& 8 16
\& 10 25
\& 12 36
\& 14 49
\& 16 64
\& 18 81
\& 20 100
\& 22 121
\& 24 144
\& 26 169
\& 28 196
\& 30 225
.Ve
.PP
This is the shebang (#!) line followed by the data, formatted as before. The
data file can be plotted simply with
.PP
.Vb 1
\& $ ./data
.Ve
.PP
The caveats here are that on Linux the whole #! line is limited to 127
characters and that the full path to feedgnuplot must be given. The 127
character limit is a serious limitation, but this can likely be resolved with a
kernel patch. I have only tried on Linux 2.6.
.PP
\fISelf-plotting data with perl inline data\fR
.IX Subsection "Self-plotting data with perl inline data"
.PP
Perl supports storing data and code in the same file. This can also be used to
create self-plotting files:
.PP
.Vb 4
\& $ cat plotdata.pl
\& #!/usr/bin/perl
\& use strict;
\& use warnings;
\&
\& open PLOT, "| feedgnuplot \-\-lines \-\-points" or die "Couldn\*(Aqt open plotting pipe";
\& while( <DATA> )
\& {
\&   my @xy = split;
\&   print PLOT "@xy\en";
\& }
\& _\|_DATA_\|_
\& 2 1
\& 4 4
\& 6 9
\& 8 16
\& 10 25
\& 12 36
\& 14 49
\& 16 64
\& 18 81
\& 20 100
\& 22 121
\& 24 144
\& 26 169
\& 28 196
\& 30 225
.Ve
.PP
This is especially useful if the logged data is not in a format directly
supported by feedgnuplot. Raw data can be stored after the _\|_DATA_\|_ directive,
with a small perl script to manipulate the data into a useable format and send
it to the plotter.
.SH "ARGUMENTS"
.IX Header "ARGUMENTS"
.IP "\(bu" 4
\&\-\-\f(CW\*(C`[no]domain\*(C'\fR
.Sp
If enabled, the first element of each line is the domain variable. If not, the
point index is used
.IP "\(bu" 4
\&\-\-\f(CW\*(C`[no]dataid\*(C'\fR
.Sp
If enabled, each data point is preceded by the \s-1ID\s0 of the data set that point
corresponds to. This \s-1ID\s0 is interpreted as a string, \s-1NOT\s0 as just a number. If not
enabled, the order of the point is used.
.Sp
As an example, if line 3 of the input is \*(L"0 9 1 20\*(R" then
.RS 4
.IP "\(bu" 4
\&\f(CW\*(C`\-\-nodomain \-\-nodataid\*(C'\fR would parse the 4 numbers as points in 4 different
curves at x=3
.IP "\(bu" 4
\&\f(CW\*(C`\-\-domain \-\-nodataid\*(C'\fR would parse the 4 numbers as points in 3 different
curves at x=0. Here, 0 is the x\-variable and 9,1,20 are the data values
.IP "\(bu" 4
\&\f(CW\*(C`\-\-nodomain \-\-dataid\*(C'\fR would parse the 4 numbers as points in 2 different
curves at x=3. Here 0 and 1 are the data IDs and 9 and 20 are the
data values
.IP "\(bu" 4
\&\f(CW\*(C`\-\-domain \-\-dataid\*(C'\fR would parse the 4 numbers as a single point at
x=0. Here 9 is the data \s-1ID\s0 and 1 is the data value. 20 is an extra
value, so it is ignored. If another value followed 20, we'd get another
point in curve \s-1ID 20\s0
.RE
.RS 4
.RE
.IP "\(bu" 4
\&\f(CW\*(C`\-\-[no]3d\*(C'\fR
.Sp
Do [not] plot in 3D. This only makes sense with \f(CW\*(C`\-\-domain\*(C'\fR. Each domain here is
an (x,y) tuple
.IP "\(bu" 4
\&\-\-\f(CW\*(C`timefmt [format]\*(C'\fR
.Sp
Interpret the X data as a time/date, parsed with the given format
.IP "\(bu" 4
\&\f(CW\*(C`\-\-colormap\*(C'\fR
.Sp
Show a colormapped xy plot. Requires extra data for the color. zmin/zmax can be
used to set the extents of the colors. Automatically sets the \f(CW\*(C`\-\-rangesize\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-stream [period]\*(C'\fR
.Sp
Plot the data as it comes in, in realtime. If period is given, replot every
period seconds. If no period is given, replot at 1Hz. If the period is given as
0 or 'trigger', replot \fIonly\fR when the incoming data dictates this. See the
\&\*(L"Real-time streaming data\*(R" section of the man page.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-[no]lines\*(C'\fR
.Sp
Do [not] draw lines to connect consecutive points
.IP "\(bu" 4
\&\f(CW\*(C`\-\-[no]points\*(C'\fR
.Sp
Do [not] draw points
.IP "\(bu" 4
\&\f(CW\*(C`\-\-circles\*(C'\fR
.Sp
Plot with circles. This requires a radius be specified for each point.
Automatically sets the \f(CW\*(C`\-\-rangesize\*(C'\fR. \f(CW\*(C`Not\*(C'\fR supported for 3d plots.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-title xxx\*(C'\fR
.Sp
Set the title of the plot
.IP "\(bu" 4
\&\f(CW\*(C`\-\-legend curveID legend\*(C'\fR
.Sp
Set the label for a curve plot. Use this option multiple times for multiple
curves. With \f(CW\*(C`\-\-dataid\*(C'\fR, curveID is the \s-1ID.\s0 Otherwise, it's the index of the
curve, starting at 0
.IP "\(bu" 4
\&\f(CW\*(C`\-\-autolegend\*(C'\fR
.Sp
Use the curve IDs for the legend. Titles given with \f(CW\*(C`\-\-legend\*(C'\fR override these
.IP "\(bu" 4
\&\f(CW\*(C`\-\-xlen xxx\*(C'\fR
.Sp
When using \f(CW\*(C`\-\-stream\*(C'\fR, sets the size of the x\-window to plot. Omit this or set
it to 0 to plot \s-1ALL\s0 the data. Does not make sense with 3d plots. Implies
\&\f(CW\*(C`\-\-monotonic\*(C'\fR
.IP "\(bu" 4
\&\f(CW\*(C`\-\-xmin/xmax/ymin/ymax/y2min/y2max/zmin/zmax xxx\*(C'\fR
.Sp
Set the range for the given axis. These x\-axis bounds are ignored in a streaming
plot. The y2\-axis bound do not apply in 3d plots. The z\-axis bounds apply
\&\fIonly\fR to 3d plots or colormaps.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-xlabel/ylabel/y2label/zlabel xxx\*(C'\fR
.Sp
Label the given axis. The y2\-axis label does not apply to 3d plots while the
z\-axis label applies \fIonly\fR to 3d plots.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-y2 xxx\*(C'\fR
.Sp
Plot the data specified by this curve \s-1ID\s0 on the y2 axis. Without \f(CW\*(C`\-\-dataid\*(C'\fR,
the \s-1ID\s0 is just an ordered 0\-based index. Does not apply to 3d plots. Can be
passed multiple times, or passed a comma-separated list. By default the y2\-axis
curves look the same as the y\-axis ones. I.e. the viewer of the resulting plot
has to be told which is which via an axes label, legend, etc. Prior to version
1.25 of feedgnuplot the curves plotted on the y2 axis were drawn with a thicker
line. This is no longer the case, but that behavior can be brought back by
passing something like
.Sp
.Vb 1
\& \-\-y2 curveid \-\-style curveid \*(Aqlinewidth 3\*(Aq
.Ve
.IP "\(bu" 4
\&\f(CW\*(C`\-\-histogram curveID\*(C'\fR
.Sp
Set up a this specific curve to plot a histogram. The bin width is given with
the \f(CW\*(C`\-\-binwidth\*(C'\fR option (assumed 1.0 if omitted). If a drawing style is not
specified for this curve (\f(CW\*(C`\-\-curvestyle\*(C'\fR) or all curves (\f(CW\*(C`\-\-with\*(C'\fR,
\&\f(CW\*(C`\-\-curvestyleall\*(C'\fR) then the default histogram style is set: filled boxes with
borders. This is what the user generally wants. This works with \f(CW\*(C`\-\-domain\*(C'\fR
and/or \f(CW\*(C`\-\-stream\*(C'\fR, but in those cases the x\-value is used \fIonly\fR to cull old
data because of \f(CW\*(C`\-\-xlen\*(C'\fR or \f(CW\*(C`\-\-monotonic\*(C'\fR. I.e. the x\-values are \fInot\fR drawn
in any way. Can be passed multiple times, or passed a comma\- separated list
.IP "\(bu" 4
\&\f(CW\*(C`\-\-binwidth width\*(C'\fR
.Sp
The width of bins when making histograms. This setting applies to \s-1ALL\s0 histograms
in the plot. Defaults to 1.0 if not given.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-histstyle style\*(C'\fR
.Sp
Normally, histograms are generated with the 'smooth frequency' gnuplot style.
\&\f(CW\*(C`\-\-histstyle\*(C'\fR can be used to select different \f(CW\*(C`smooth\*(C'\fR settings (see the
gnuplot \f(CW\*(C`help smooth\*(C'\fR page for more info). Allowed values are 'frequency' (the
default), 'fnormal' (available in very recent gnuplots), 'unique', 'cumulative'
and 'cnormal'. 'fnormal' is a normalized histogram. 'unique' indicates whether a
bin has at least one item in it: instead of counting the items, it'll always
report 0 or 1. 'cumulative' is the integral of the 'frequency' histogram.
\&'cnormal' is like 'cumulative', but rescaled to end up at 1.0.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-style curveID style\*(C'\fR
.Sp
Additional styles per curve. With \f(CW\*(C`\-\-dataid\*(C'\fR, curveID is the \s-1ID.\s0 Otherwise,
it's the index of the curve, starting at 0. curveID can be a comma-separated
list of IDs to which the given style should apply. Use this option multiple
times for multiple curves. \f(CW\*(C`\-\-styleall\*(C'\fR does \fInot\fR apply to curves that have a
\&\f(CW\*(C`\-\-style\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-curvestyle curveID\*(C'\fR
.Sp
Synonym for \f(CW\*(C`\-\-style\*(C'\fR
.IP "\(bu" 4
\&\f(CW\*(C`\-\-styleall xxx\*(C'\fR
.Sp
Additional styles for all curves that have no \f(CW\*(C`\-\-style\*(C'\fR. This is overridden by
any applicable \f(CW\*(C`\-\-style\*(C'\fR. Exclusive with \f(CW\*(C`\-\-with\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-curvestyleall xxx\*(C'\fR
.Sp
Synonym for \f(CW\*(C`\-\-styleall\*(C'\fR
.IP "\(bu" 4
\&\f(CW\*(C`\-\-with xxx\*(C'\fR
.Sp
Same as \f(CW\*(C`\-\-styleall\*(C'\fR, but prefixed with \*(L"with\*(R". Thus
.Sp
.Vb 1
\& \-\-with boxes
.Ve
.Sp
is equivalent to
.Sp
.Vb 1
\& \-\-styleall \*(Aqwith boxes\*(Aq
.Ve
.Sp
Exclusive with \f(CW\*(C`\-\-styleall\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-extracmds xxx\*(C'\fR
.Sp
Additional commands to pass on to gnuplot verbatim. These could contain extra
global styles for instance. Can be passed multiple times.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-set xxx\*(C'\fR
.Sp
Additional 'set' commands to pass on to gnuplot verbatim. \f(CW\*(C`\-\-set \*(Aqa b c\*(Aq\*(C'\fR will
result in gnuplot seeing a \f(CW\*(C`set a b c\*(C'\fR command. Can be passed multiple times.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-unset xxx\*(C'\fR
.Sp
Additional 'unset' commands to pass on to gnuplot verbatim. \f(CW\*(C`\-\-unset \*(Aqa b c\*(Aq\*(C'\fR
will result in gnuplot seeing a \f(CW\*(C`unset a b c\*(C'\fR command. Can be passed multiple
times.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-equation xxx\*(C'\fR
.Sp
Gnuplot can plot both data and symbolic equations. \f(CW\*(C`feedgnuplot\*(C'\fR generally
plots data, but with this option can plot symbolic equations \fIalso\fR. This is
generally intended to augment data plots, since for equation-only plots you
don't need \f(CW\*(C`feedgnuplot\*(C'\fR. \f(CW\*(C`\-\-equation\*(C'\fR can be passed multiple times for
multiple equations. The given strings are passed to gnuplot directly without any
thing added or removed, so styling and such should be applied in the string. A
basic example:
.Sp
.Vb 3
\& seq 100 | awk \*(Aq{print $1/10, $1/100}\*(Aq |
\&   feedgnuplot \-\-with \*(Aqlines lw 3\*(Aq \-\-domain \-\-ymax 1
\&               \-\-equation \*(Aqsin(x)/x\*(Aq \-\-equation \*(Aqcos(x)/x with lines lw 4\*(Aq
.Ve
.Sp
Here I plot the incoming data (points along a line) with the given style (a line
with thickness 3), \fIand\fR I plot two damped sinusoids on the same plot. The
sinusoids are not affected by \f(CW\*(C`feedgnuplot\*(C'\fR styling, so their styles are set
separately, as in this example. More complicated example:
.Sp
.Vb 3
\& seq 360 | perl \-nE \*(Aq$th=$_/360 * 3.14*2; $c=cos($th); $s=sin($th); say "$c $s"\*(Aq |
\&   feedgnuplot \-\-domain \-\-square
\&               \-\-set parametric \-\-set "trange [0:2*3.14]" \-\-equation "sin(t),cos(t)"
.Ve
.Sp
Here the data I generate is points along the unit circle. I plot these as
points, and I \fIalso\fR plot a true circle as a parametric equation.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-square\*(C'\fR
.Sp
Plot data with aspect ratio 1. For 3D plots, this controls the aspect ratio for
all 3 axes
.IP "\(bu" 4
\&\f(CW\*(C`\-\-square_xy\*(C'\fR
.Sp
For 3D plots, set square aspect ratio for \s-1ONLY\s0 the x,y axes
.IP "\(bu" 4
\&\f(CW\*(C`\-\-hardcopy xxx\*(C'\fR
.Sp
If not streaming, output to a file specified here. Format inferred from
filename, unless specified by \f(CW\*(C`\-\-terminal\*(C'\fR. If \f(CW\*(C`\-\-terminal\*(C'\fR is given,
\&\f(CW\*(C`\-\-hardcopy\*(C'\fR sets \fIonly\fR the output filename.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-terminal xxx\*(C'\fR
.Sp
String passed to 'set terminal'. No attempts are made to validate this.
\&\f(CW\*(C`\-\-hardcopy\*(C'\fR sets this to some sensible defaults if \f(CW\*(C`\-\-hardcopy\*(C'\fR is set to a
filename ending in \f(CW\*(C`.png\*(C'\fR, \f(CW\*(C`.pdf\*(C'\fR, \f(CW\*(C`.ps\*(C'\fR, \f(CW\*(C`.eps\*(C'\fR or \f(CW\*(C`.svg\*(C'\fR. If any other
file type is desired, use both \f(CW\*(C`\-\-hardcopy\*(C'\fR and \f(CW\*(C`\-\-terminal\*(C'\fR
.IP "\(bu" 4
\&\f(CW\*(C`\-\-maxcurves xxx\*(C'\fR
.Sp
The maximum allowed number of curves. This is 100 by default, but can be reset
with this option. This exists purely to prevent perl from allocating all of the
system's memory when reading bogus data
.IP "\(bu" 4
\&\f(CW\*(C`\-\-monotonic\*(C'\fR
.Sp
If \f(CW\*(C`\-\-domain\*(C'\fR is given, checks to make sure that the x\- coordinate in the input
data is monotonically increasing. If a given x\-variable is in the past, all data
currently cached for this curve is purged. Without \f(CW\*(C`\-\-monotonic\*(C'\fR, all data is
kept. Does not make sense with 3d plots. No \f(CW\*(C`\-\-monotonic\*(C'\fR by default. The data is
replotted before being purged
.IP "\(bu" 4
\&\f(CW\*(C`\-\-rangesize curveID xxx\*(C'\fR
.Sp
The options \f(CW\*(C`\-\-rangesizeall\*(C'\fR, \f(CW\*(C`\-\-rangesize\*(C'\fR and \f(CW\*(C`\-\-extraValuesPerPoint\*(C'\fR set
the number of values are needed to represent each point being plotted (see
\&\*(L"Multi-value style support\*(R" above). These options are \fIonly\fR needed if
unknown styles are used, with \f(CW\*(C`\-\-styleall\*(C'\fR or \f(CW\*(C`\-\-with\*(C'\fR for instance.
.Sp
\&\f(CW\*(C`\-\-rangesize\*(C'\fR is used to set how many values are needed to represent the range
of a point for a particular curve. This overrides any defaults that may exist
for this curve only.
.Sp
With \f(CW\*(C`\-\-dataid\*(C'\fR, curveID is the \s-1ID.\s0 Otherwise, it's the index of the curve,
starting at 0. curveID can be a comma-separated list of IDs to which the given
rangesize should apply.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-rangesizeall xxx\*(C'\fR
.Sp
Like \f(CW\*(C`\-\-rangesize\*(C'\fR, but applies to \fIall\fR the curves.
.Sp
\&\f(CW\*(C`\-\-extraValuesPerPoint xxx\*(C'\fR
.Sp
Like \f(CW\*(C`\-\-rangesizeall\*(C'\fR, but instead of overriding the default, adds to it. For
example, if plotting non-lopsided y errorbars gnuplot wants (x,y,ydelta) tuples.
These can be specified both with \f(CW\*(C`\-\-rangesizeall 2\*(C'\fR (because there are 2 range
values) or \f(CW\*(C`\-\-extraValuesPerPoint 1\*(C'\fR (because there's 1 more value than usual).
.Sp
This option is \fIonly\fR needed if unknown styles are used, with \f(CW\*(C`\-\-styleall\*(C'\fR or
\&\f(CW\*(C`\-\-with\*(C'\fR for instance.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-dump\*(C'\fR
.Sp
Instead of printing to gnuplot, print to \s-1STDOUT.\s0 Very useful for debugging. It
is possible to send the output produced this way to gnuplot directly.
.IP "\(bu" 4
\&\f(CW\*(C`\-\-exit\*(C'\fR
.Sp
This controls the details of what happens when the input data is exhausted, or
when some part of the \f(CW\*(C`feedgnuplot\*(C'\fR pipeline is killed. This option does
different things depending on whether \f(CW\*(C`\-\-stream\*(C'\fR is active, so read this
closely.
.Sp
With interactive gnuplot terminals (qt, x11, wxt), the plot windows live in a
separate process from the main \f(CW\*(C`gnuplot\*(C'\fR process. It is thus possible for the
main \f(CW\*(C`gnuplot\*(C'\fR process to exit, while leaving the plot windows up (a caveat is
that such decapitated windows aren't interactive). To be clear, there are 3
possible states:
.RS 4
.ie n .IP "Alive: ""feedgnuplot"", ""gnuplot"" alive, plot window process alive, no shell prompt (shell busy with ""feedgnuplot"")" 4
.el .IP "Alive: \f(CWfeedgnuplot\fR, \f(CWgnuplot\fR alive, plot window process alive, no shell prompt (shell busy with \f(CWfeedgnuplot\fR)" 4
.IX Item "Alive: feedgnuplot, gnuplot alive, plot window process alive, no shell prompt (shell busy with feedgnuplot)"
.PD 0
.ie n .IP "Half-alive: ""feedgnuplot"", ""gnuplot"" dead, plot window process alive (but non-interactive), shell prompt available" 4
.el .IP "Half-alive: \f(CWfeedgnuplot\fR, \f(CWgnuplot\fR dead, plot window process alive (but non-interactive), shell prompt available" 4
.IX Item "Half-alive: feedgnuplot, gnuplot dead, plot window process alive (but non-interactive), shell prompt available"
.ie n .IP "Dead: ""feedgnuplot"", ""gnuplot"" dead, plot window process dead, shell prompt available" 4
.el .IP "Dead: \f(CWfeedgnuplot\fR, \f(CWgnuplot\fR dead, plot window process dead, shell prompt available" 4
.IX Item "Dead: feedgnuplot, gnuplot dead, plot window process dead, shell prompt available"
.RE
.RS 4
.PD
.Sp
The \f(CW\*(C`\-\-exit\*(C'\fR option controls the details of this behavior. The possibilities
are:
.ie n .IP "No ""\-\-stream"", input pipe is exhausted (all data read in)" 4
.el .IP "No \f(CW\-\-stream\fR, input pipe is exhausted (all data read in)" 4
.IX Item "No --stream, input pipe is exhausted (all data read in)"
.RS 4
.PD 0
.ie n .IP "default; no ""\-\-exit""" 4
.el .IP "default; no \f(CW\-\-exit\fR" 4
.IX Item "default; no --exit"
.PD
Alive. Need to Ctrl-C to get back into the shell
.ie n .IP """\-\-exit""" 4
.el .IP "\f(CW\-\-exit\fR" 4
.IX Item "--exit"
Half-alive. Non-interactive prompt up, and the shell accepts new commands.
Without \f(CW\*(C`\-\-stream\*(C'\fR the goal is to show a plot, so a Dead state is not useful
here.
.RE
.RS 4
.RE
.ie n .IP """\-\-stream"", input pipe is exhausted (all data read in) or the ""feedgnuplot"" process terminated" 4
.el .IP "\f(CW\-\-stream\fR, input pipe is exhausted (all data read in) or the \f(CWfeedgnuplot\fR process terminated" 4
.IX Item "--stream, input pipe is exhausted (all data read in) or the feedgnuplot process terminated"
.RS 4
.PD 0
.ie n .IP "default; no ""\-\-exit""" 4
.el .IP "default; no \f(CW\-\-exit\fR" 4
.IX Item "default; no --exit"
.PD
Alive. Need to Ctrl-C to get back into the shell
.ie n .IP """\-\-exit""" 4
.el .IP "\f(CW\-\-exit\fR" 4
.IX Item "--exit"
Dead. No plot is shown, and the shell accepts new commands. With \f(CW\*(C`\-\-stream\*(C'\fR the
goal is to show a plot as the data comes in, which we have been doing. Now that
we're done, we can clean up everything.
.RE
.RS 4
.RE
.RE
.RS 4
.Sp
Note that one usually invokes \f(CW\*(C`feedgnuplot\*(C'\fR as a part of a shell pipeline:
.Sp
.Vb 1
\& $ write_data | feedgnuplot
.Ve
.Sp
If the user terminates this pipeline with ^C, then \fIall\fR the processes in the
pipeline receive \s-1SIGINT.\s0 This normally kills \f(CW\*(C`feedgnuplot\*(C'\fR and all its
\&\f(CW\*(C`gnuplot\*(C'\fR children, and we let this happen unless \f(CW\*(C`\-\-stream\*(C'\fR and no \f(CW\*(C`\-\-exit\*(C'\fR.
If \f(CW\*(C`\-\-stream\*(C'\fR and no \f(CW\*(C`\-\-exit\*(C'\fR, then we ignore the first ^C. The data feeder
dies, and we behave as if the input data was exhausted. A second ^C kills us
also.
.RE
.IP "\(bu" 4
\&\f(CW\*(C`\-\-geometry\*(C'\fR
.Sp
If using X11, specifies the size, position of the plot window
.IP "\(bu" 4
\&\f(CW\*(C`\-\-version\*(C'\fR
.Sp
Print the version and exit
.SH "RECIPES"
.IX Header "RECIPES"
.SS "Basic plotting of piped data"
.IX Subsection "Basic plotting of piped data"
.Vb 6
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq
\& 2 1
\& 4 4
\& 6 9
\& 8 16
\& 10 25
\&
\& $ seq 5 | awk \*(Aq{print 2*$1, $1*$1}\*(Aq |
\&   feedgnuplot \-\-lines \-\-points \-\-legend 0 "data 0" \-\-title "Test plot" \-\-y2 1
.Ve
.SS "Realtime plot of network throughput"
.IX Subsection "Realtime plot of network throughput"
Looks at wlan0 on Linux.
.PP
.Vb 3
\& $ while true; do sleep 1; cat /proc/net/dev; done |
\&   gawk \*(Aq/wlan0/ {if(b) {print $2\-b; fflush()} b=$2}\*(Aq |
\&   feedgnuplot \-\-lines \-\-stream \-\-xlen 10 \-\-ylabel \*(AqBytes/sec\*(Aq \-\-xlabel seconds
.Ve
.SS "Realtime plot of battery charge in respect to time"
.IX Subsection "Realtime plot of battery charge in respect to time"
Uses the result of the \f(CW\*(C`acpi\*(C'\fR command.
.PP
.Vb 3
\& $ while true; do acpi; sleep 15; done |
\&   perl \-nE \*(AqBEGIN{ $| = 1; } /([0\-9]*)%/; say join(" ", time(), $1);\*(Aq |
\&   feedgnuplot \-\-stream \-\-ymin 0 \-\-ymax 100 \-\-lines \-\-domain \-\-xlabel \*(AqTime\*(Aq \-\-timefmt \*(Aq%s\*(Aq \-\-ylabel "Battery charge (%)"
.Ve
.SS "Realtime plot of temperatures in an \s-1IBM\s0 Thinkpad"
.IX Subsection "Realtime plot of temperatures in an IBM Thinkpad"
Uses \f(CW\*(C`/proc/acpi/ibm/thermal\*(C'\fR, which reports temperatures at various locations
in a Thinkpad.
.PP
.Vb 2
\& $ while true; do cat /proc/acpi/ibm/thermal | awk \*(Aq{$1=""; print}\*(Aq ; sleep 1; done |
\&   feedgnuplot \-\-stream \-\-xlen 100 \-\-lines \-\-autolegend \-\-ymax 100 \-\-ymin 20 \-\-ylabel \*(AqTemperature (deg C)\*(Aq
.Ve
.SS "Plotting a histogram of file sizes in a directory, granular to 10MB"
.IX Subsection "Plotting a histogram of file sizes in a directory, granular to 10MB"
.Vb 4
\& $ ls \-l | awk \*(Aq{print $5/1e6}\*(Aq |
\&   feedgnuplot \-\-histogram 0
\&     \-\-binwidth 10
\&     \-\-ymin 0 \-\-xlabel \*(AqFile size (MB)\*(Aq \-\-ylabel Frequency
.Ve
.SS "Plotting points on top of an existing image"
.IX Subsection "Plotting points on top of an existing image"
This can be done by using \f(CW\*(C`\-\-equation\*(C'\fR to pass arbitrary plot input to gnuplot:
.PP
.Vb 3
\& $ < features_xy.data
\&   feedgnuplot \-\-points \-\-domain
\&     \-\-equation \*(Aq"image.png" binary filetype=png flipy with rgbimage\*(Aq
.Ve
.PP
Here an existing image is given to gnuplot verbatim, and data to plot on top of
it is interpreted by feedgnuplot as usual. \f(CW\*(C`flipy\*(C'\fR is useful here because
usually the y axis points up, but when looking at images, this is usually
reversed: the origin is the top-left pixel.
.SH "ACKNOWLEDGEMENT"
.IX Header "ACKNOWLEDGEMENT"
This program is originally based on the driveGnuPlots.pl script from
Thanassis Tsiodras. It is available from his site at
<http://users.softlab.ece.ntua.gr/~ttsiod/gnuplotStreaming.html>
.SH "REPOSITORY"
.IX Header "REPOSITORY"
<https://github.com/dkogan/feedgnuplot>
.SH "AUTHOR"
.IX Header "AUTHOR"
Dima Kogan, \f(CW\*(C`<dima@secretsauce.net>\*(C'\fR
.SH "LICENSE AND COPYRIGHT"
.IX Header "LICENSE AND COPYRIGHT"
Copyright 2011\-2012 Dima Kogan.
.PP
This program is free software; you can redistribute it and/or modify it
under the terms of either: the \s-1GNU\s0 General Public License as published
by the Free Software Foundation; or the Artistic License.
.PP
See http://dev.perl.org/licenses/ for more information.