## NAME

          pshistogram - Bin data and plot histograms

## SYNOPSIS

          pshistogram file -Jxxscale[/yscale] -Wbin_width [ -2 ] [ -A ] [
          -Btickinfo ] [ -C ] [ -Eazimuth/elevation ] [ -Gfill ] [ -H[nrec] ] [
          -I[o] ] [ -K ] [ -Lpen ] [ -O ] [ -P ] [ -Q ] [
          -Rwest/east/south/north[r] ] [ -S ] [ -U[/dx/dy/][label] ] [ -V ] [
          -Xx-shift ] [ -Yy-shift ] [ -Ztype ] [ -ccopies ] [ -bi[s][n] ]

## DESCRIPTION

          pshistogram reads the first column from file [or standard input] and
          calculates histogram parameters based on the bin-width provided.
          Using these parameters, scaling, and optional range parameters it will
          generate PostScript code that plots a histogram.  A cumulative
          histogram may also be specified.

          file ASCII [or binary, see -b] datafile. If no file is given,
               pshistogram will read standard input.

          -Jx  xscale[/yscale] (Linear scale(s) in inch/unit).

          -W   Sets the bin width used for histogram calculations.

## OPTIONS

          No space between the option flag and the associated arguments.

          -B   Sets map boundary tickmark intervals. See psbasemap for details.

          -2   Read second rather than first column.

          -A   Plot the histogram horizontally from x = 0 [Default is vertically
               from y = 0].

          -C   Center bin on each value. [Default is left edge].

          -E   Sets the viewpoint's azimuth and elevation (for perspective view)
               [180/90]

          -G   Select filling of bars.  [Default is no fill].  Specify the shade
               (0-255) or color (r/g/b), or -Gpdpi/pattern, where pattern gives
               the number of the built-in pattern (1-90) OR the name of a Sun
               1-, 8-, or 24-bit raster file.  dpi sets the resolution of the
               image.  For 1-bit rasters: use -GP for inverse video, or append
               :Fr/g/b[B[r/g/b]] to specify fore- and background colors (use
               r/g/b = - for transparency).  See GMT Cookbook & Technical
               Reference Appendix E for information on individual patterns.

          -H   Input file(s) has Header record(s).  Number of header records can
               be changed by editing your .gmtdefaults file.  If used, GMT
               default is 1 header record.

          -I   Inquire about min/max x and y after binning.  No plotting is
               done.  Append o to output an ASCII table of the resulting x,y
               data.

          -K   More PostScript code will be appended later [Default terminates
               the plot system].

          -L   Draw bar outline using the specified pen thickness.  [Default is
               no outline].

          -O   Selects Overlay plot mode [Default initializes a new plot
               system].

          -P   Selects Portrait plotting mode [GMT Default is Landscape, see
               gmtdefaults to change this].

          -Q   Draw a cumulative histogram.

          -R   west, east, south, and north specify the Region of interest.  To
               specify boundaries in degrees and minutes [and seconds], use the
               dd:mm[:ss] format.  Append r if lower left and upper right map
               coordinates are given instead of wesn.  If not given, pshistogram
               will automatically find reasonable values for the region.

          -S   Draws a stairs-step diagram instead of histogram.

          -U   Draw Unix System time stamp on plot.  User may specify where the
               lower left corner of the stamp should fall on the page relative
               to lower left corner of plot in inch [Default is (-0.75i/-
               0.75i)].  Optionally, append a label, or c (which will plot the
               command string.)

          -V   Selects verbose mode, which will send progress reports to stderr
               [Default runs "silently"].

          -X -Y
               Shift origin of plot by (x-shift,y-shift) inch  [Default is
               (a1i,a1i) for new plots, (0,0) for overlays].  Prepend a for
               absolute coordinates; the default (r) will reset plot origin.

          -Z   Choose between 6 types of histograms: 0 = counts [Default], 1 =
               frequency_percent, 2 = log (1.0 + count), 3 = log (1.0 +
               frequency_percent), 4 = log10 (1.0 + count), 5 = log10 (1.0 +
               frequency_percent).

          -c   Specifies the number of plot copies. [Default is 1]

          -bi  Selects binary input.  Append s for single precision [Default is
               double].  Append n for the number of columns in the binary
               file(s).  [Default is 2 input columns].

## EXAMPLES

          To draw a histogram of the data v3206.t containing seafloor depths,
          using a 250 meter bin width, center bars, and draw bar outline, try:

          pshistogram v3206.t -JXh -W250 -C -L0.5p -V > plot.ps

          If you know the distribution of your data, you may explicitly specify
          range and scales.  E.g., to plot a histogram of the y-values (2nd
          column) in the file errors.xy using a 1 meter bin width, plot from -10
          to +10 meters @ 0.3 inch/m, annotate every 2 m and 100 counts, and use
          black bars, try:

          cut -f2 errors.xy | pshistogram -W1 -R-10/10/0/0 -Jx0.3i/0.01i
          -B2:Error:/100:Counts: -G0 -V > plot.ps

          Since no y-range was specified, pshistogram will calculate ymax in
          even increments of 100.

## SEE ALSO

          gmt, psbasemap, psrose, psxy