pshistogram (1) - Linux Manuals

pshistogram: Calculate and plot histograms

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.

BUGS

The -W option does not yet work properly with time series data (e.g., -f0T). Thus, such variable intervals as months and years are not calculated. Instead, specify your interval in the same units as the current setting of TIME_UNIT.

COPYRIGHT

2015, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe