.TH r.quantile 1grass "" "GRASS 7.8.5" "GRASS GIS User's Manual"
.SH NAME
\fI\fBr.quantile\fR\fR  \- Compute quantiles using two passes.
.SH KEYWORDS
raster, algebra, statistics, percentile, quantile
.SH SYNOPSIS
\fBr.quantile\fR
.br
\fBr.quantile \-\-help\fR
.br
\fBr.quantile\fR [\-\fBr\fR] \fBinput\fR=\fIname\fR  [\fBquantiles\fR=\fIinteger\fR]   [\fBpercentiles\fR=\fIfloat\fR[,\fIfloat\fR,...]]   [\fBbins\fR=\fIinteger\fR]   [\fBfile\fR=\fIname\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-r\fR" 4m
.br
Generate recode rules based on quantile\-defined intervals
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of input raster map
.IP "\fBquantiles\fR=\fIinteger\fR" 4m
.br
Number of quantiles
.br
Default: \fI4\fR
.IP "\fBpercentiles\fR=\fIfloat[,\fIfloat\fR,...]\fR" 4m
.br
List of percentiles
.IP "\fBbins\fR=\fIinteger\fR" 4m
.br
Number of bins to use
.br
Default: \fI1000000\fR
.IP "\fBfile\fR=\fIname\fR" 4m
.br
Name for output file (if omitted or \(dq\-\(dq output to stdout)
.SH DESCRIPTION
\fIr.quantile\fR computes quantiles in a manner suitable
for use with large amounts of data. It is using two passes.
.SH EXAMPLE
Calculation of elevation quantiles (printed to standard\-out):
.br
.nf
\fC
g.region raster=elevation \-p
r.quantile input=elevation percentiles=0.1,1,10,25,50,75,90,99,99.9
\fR
.fi
The output of \fIr.quantile\fR can be used for quantile classification:
.br
.nf
\fC
g.region raster=elevation \-p
r.quantile elevation quantiles=5 \-r \-\-quiet | r.recode elevation \(rs
           out=elev_quant5 rules=\-
\fR
.fi
.SH SEE ALSO
\fI
r.mode,
r.quant,
r.recode,
r.series,
r.stats,
r.stats.quantile,
r.stats.zonal,
r.statistics,
r.univar,
v.rast.stats
\fR
.SH AUTHOR
Glynn Clements
.SH SOURCE CODE
.PP
Available at: r.quantile source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual