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NAME

       d.histogram  - Displays a histogram in the form of a pie or bar chart for a user-specified
       raster map.

KEYWORDS

       display

SYNOPSIS

       d.histogram
       d.histogram help
       d.histogram    [-nqC]    map=name     [style=string]      [color=name]      [bgcolor=name]
       [nsteps=integer]   [--verbose]  [--quiet]

   Flags:
       -n
           Display information for null cells

       -q
           Gather the histogram quietly

       -C
           Report for ranges defined in cats file (fp maps only)

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       map=name
           Raster map for which histogram will be displayed

       style=string
           Indicate if a pie or bar chart is desired
           Options: pie,bar
           Default: bar

       color=name
           Color for text and axes
           Either a standard color name or R:G:B triplet
           Default: black

       bgcolor=name
           Background color
           Either a standard GRASS color, R:G:B triplet, or "none"
           Default: white

       nsteps=integer
           Number of steps to divide the data range into (fp maps only)
           Default: 255

DESCRIPTION

       d.histogram  displays  the  category-value  distribution  for  a user-specified raster map
       layer, in the form of a bar chart or a pie chart.  The display will be  displayed  in  the
       active  display  frame on the graphics monitor, using the colors in the raster map layer's
       color table.  The program determines the  raster  map's  category  value  distribution  by
       counting cells.

NOTES

       d.histogram  respects  the current geographic region settings and the current MASK (if one
       exists).

       d.histogram uses the colors in the map's color look-up table  (i.e.,  the  map's  colr  or
       colr2 file).

SEE ALSO

        d.colors, d.colortable, d.frame, d.graph, d.linegraph, d.polar, g.region, r.stats

AUTHOR

       Dave Johnson
        DBA Systems, Inc.
        10560 Arrowhead Drive
        Fairfax, Virginia 22030

       Last changed: $Date: 2007-05-17 10:13:14 +0200 (Thu, 17 May 2007) $

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