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 distance unit/data 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, each in 0-255).

       -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].

       -bo    Selects binary output. Append s for single precision [Default is double].

       -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.
              Optionally,  append  a  label,  or c (which will plot the command string.). The GMT
              parameters  UNIX_TIME  and  UNIX_TIME_POS  can  affect  the  appearance;  see   the
              gmtdefaults man page for details.

       -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).  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 @ 0.75 cm/m, annotate every 2 m and 100
       counts, and use black bars, try:

       cut -f2 errors.xy | pshistogram -W1 -R-10/10/0/0 -Jx0.75c/0.01c -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(1gmt), psbasemap(1gmt), psrose(1gmt), psxy(1gmt)

                                            1 Jan 2004                             PSHISTOGRAM(l)