NAME¶
stilts-tloop - Generates a single-column table from a loop
variable
SYNOPSIS¶
stilts tloop [ocmd=<cmds>]
[omode=out|meta|stats|count|checksum|cgi|discard|topcat|samp|tosql|gui]
[out=<out-table>] [ofmt=<out-format>]
[colname=<value>] [start=<float-value>]
[end=<float-value>] [step=<float-value>]
[forcefloat=true|false]
DESCRIPTION¶
tloop generates a one-column table where the values in the
column are effectively populated from a for loop (start, end, step). This
may be useful as it is, or it can be postprocessed with ocmd
parameters to add more columns etc.
OPTIONS¶
- ocmd=<cmds>
Specifies processing to be performed on the output table,
after all other processing has taken place. The value of this parameter is one
or more of the filter commands described in SUN/256. If more than one is
given, they must be separated by semicolon characters (";"). This
parameter can be repeated multiple times on the same command line to build up
a list of processing steps. The sequence of commands given in this way defines
the processing pipeline which is performed on the table.
Commands may alteratively be supplied in an external file, by
using the indirection character '@'. Thus a value of
"@filename" causes the file filename to be read for
a list of filter commands to execute. The commands in the file may be
separated by newline characters and/or semicolons, and lines which are blank
or which start with a '#' character are ignored.
- omode=out|meta|stats|count|checksum|cgi|discard|topcat|samp|tosql|gui
The mode in which the result table will be output. The
default mode is
out, which means that the result will be written as a
new table to disk or elsewhere, as determined by the
out and
ofmt parameters. However, there are other possibilities, which
correspond to uses to which a table can be put other than outputting it, such
as displaying metadata, calculating statistics, or populating a table in an
SQL database. For some values of this parameter, additional parameters
(
<mode-args>) are required to determine the exact behaviour.
Possible values are
- out
- meta
- stats
- count
- checksum
- cgi
- discard
- topcat
- samp
- tosql
- gui
Use the
help=omode flag or see SUN/256 for more information.
- out=<out-table>
The location of the output table. This is usually a
filename to write to. If it is equal to the special value "-" (the
default) the output table will be written to standard output.
This parameter must only be given if omode has its default
value of "out".
- ofmt=<out-format>
Specifies the format in which the output table will be
written (one of the ones in SUN/256 - matching is case-insensitive and you can
use just the first few letters). If it has the special value
"
(auto)" (the default), then the output filename will be
examined to try to guess what sort of file is required usually by looking at
the extension. If it's not obvious from the filename what output format is
intended, an error will result.
This parameter must only be given if omode has its default
value of "out".
- colname=<value>
Gives the name of the single column produced by this
command.
- start=<float-value>
Gives the starting value of the loop variable. This will
the the value in the first row of the table.
- end=<float-value>
Gives the value which the loop variable will not exceed.
Exceeding is in the positive or negative sense according to the sense of the
step parameter, as usual for a
for-type loop.
- step=<float-value>
Amount by which the loop variable will be incremented at
each iteration, i.e. each table row.
- forcefloat=true|false
Affects the data type of the loop variable column. If
true, the column is always floating point. If false, and if the other
parameters are all of integer type, the column will be an integer column.
AUTHOR¶
Mark Taylor (Bristol University)
