NAME

       pshistogram - Bin data and plot histograms


SYNOPSIS

       pshistogram file -Jxxscale[/yscale] -Wbin_width [ -2 ] [ -A ] [ -Btick-
       info ] [ -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 gener-
       ate 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, pshis-
              togram 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 the psbasemap man page
              for details.

       -2     Read second rather than first column.

       -A     Plot  the  histogram  horizontally from x = 0 [Default is verti-
              cally 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].

       -G     Set  fill  of  positive  wiggles. [Default is black] 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  sys-
              tem].

       -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, pshis-
              togram 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 abso-
              lute 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 + fre-
              quency_percent), 4 = log10 (1.0 + count), 5 = log10 (1.0 +  fre-
              quency_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 col-
       umn) 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(l), psbasemap(l), psrose(l), psxy(l)



GMT3.4.6                          1 Jan 2005                    PSHISTOGRAM(l)

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