pshistogramgmt - Online in the Cloud

PROGRAM:

NAME

pshistogram - Calculate and plot histograms

SYNOPSIS

pshistogram [ table ] x|Xparameters bin_width[+l|h|b] [ ] [ [p|s]parameters ] [ cpt ] [
[+b][+ffont][+ooff][+r] ] [ ] [ fill ] [ z|Zparameters ] [ [o|O] ] [ ] [ pen ] [
[mode][+ppen] ] [ ] [ ] [ ] [ region ] [ ] [ [just/dx/dy/][c|label] ] [ [level] ] [
x_offset ] [ y_offset ] [ type ] [ -bi<binary> ] [ -ccopies ] [ -di<nodata> ] [ -f<flags>
] [ -h<headers> ] [ -i<flags> ] [ -p<flags> ] [ -t<transp> ]

Note: No space is allowed between the option flag and the associated arguments.

DESCRIPTION

pshistogram reads file [or standard input] and examines the first data column (or use -i)
to calculate 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.

REQUIRED ARGUMENTS

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

-Wbin_width[+l|h|b]
Sets the bin width used for histogram calculations. The modifiers specify the
handling of extreme values that fall outside the range set by -R. By default these
values are ignored. Use +b to let these values be included in the first or last
bins. To only include extreme values below first bin into the first bin, use +l,
and to only include extreme values above the last bin into that last bin, use +h.

OPTIONAL ARGUMENTS

table One or more ASCII (or binary, see -bi[ncols][type]) data table file(s) holding a
number of data columns. If no tables are given then we read from standard input.

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

-B[p|s]parameters (more ...)
Set map boundary intervals.

-Ccpt Give a CPT file. The mid x-value for each bar is used to look-up the bar color.

-D[+b][+ffont][+ooff][+r]
Annotate each bar with the count it represents. Append any of the following
modifiers: Use +b to place the labels beneath the bars instead of above; use +f to
change to another font than the default annotation font; use +o to change the
offset between bar and label [6p]; use +r to rotate the labels from horizontal to
vertical.

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

-Gfill Select filling of bars [Default is no fill].

-I[o|O]
Inquire about min/max x and y after binning. The xmin xmax ymin ymax is output; no
plotting is done. Append o to output an ASCII table of the resulting x,y data
instead. Upper case O will output all x,y bin data even when y == 0.

-Jz|Zparameters (more ...)
Set z-axis scaling; same syntax as -Jx.

-K (more ...)
Do not finalize the PostScript plot.

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

-N[mode][+ppen]
Draw the equivalent normal distribution; append desired pen [0.5p,black]. The mode
selects which central location and scale to use:

· 0 = mean and standard deviation [Default];

· 1 = median and L1 scale;

· 2 = LMS mode and scale.

The -N option may be repeated to draw several of these curves.

-O (more ...)
Append to existing PostScript plot.

-P (more ...)
Select "Portrait" plot orientation.

-Q Draw a cumulative histogram.

-R[unit]xmin/xmax/ymin/ymax[r] (more ...)
Specify the region of interest.

For perspective view p, optionally append /zmin/zmax. (more ...) If not given, pshistogram
will automatically find reasonable values for the region.

-S Draws a stairs-step diagram which does not include the internal bars of the default
histogram.

-U[just/dx/dy/][c|label] (more ...)
Draw GMT time stamp logo on plot.

-V[level] (more ...)
Select verbosity level [c].

-X[a|c|f|r][x-shift[u]]

-Y[a|c|f|r][y-shift[u]] (more ...)
Shift plot origin.

-Ztype 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).

-bi[ncols][t] (more ...)
Select native binary input. [Default is 2 input columns].

-ccopies (more ...)
Specify number of plot copies [Default is 1].

-dinodata (more ...)
Replace input columns that equal nodata with NaN.

-f[i|o]colinfo (more ...)
Specify data types of input and/or output columns.

-h[i|o][n][+c][+d][+rremark][+rtitle] (more ...)
Skip or produce header record(s).

-icols[l][sscale][ooffset][,...] (more ...)
Select input columns (0 is first column).

-p[x|y|z]azim/elev[/zlevel][+wlon0/lat0[/z0]][+vx0/y0] (more ...)
Select perspective view.

-t[transp] (more ...)
Set PDF transparency level in percent.

-^ or just -
Print a short message about the syntax of the command, then exits (NOTE: on Windows
use just -).

-+ or just +
Print an extensive usage (help) message, including the explanation of any
module-specific option (but not the GMT common options), then exits.

-? or no arguments
Print a complete usage (help) message, including the explanation of options, then
exits.

--version
Print GMT version and exit.

--show-datadir
Print full path to GMT share directory and exit.

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, use:

gmt pshistogram v3206.t -JXh -W250 -F -LP0.5p -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, run:

gmt pshistogram errors.xy -W1 -R-10/10/0/0 -Jxc/0.01c
-Bx2+lError -By100+lCounts: -Gblack -i1 -V > plot.ps

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

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