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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