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HIST2D

HIST2D

Purpose

Compute a 2-d histogram for an array of points.

Calling Sequence

h2d = hist2d( x, y)

Inputs

x, y = 2-d point coordinates. in

Keywords

MIN=mn set lower left corner of region to
histogram in (x,y) space. If x and y are
of type byte the default is 0. If MIN is not
given and type is not byte then the arrays are
searched for their min values. If MIN is a scalar
or 1 element array then that value is applied to both
x and y. To set both x and y minimums separately
send MIN as the d element array [xmin, ymin].
MAX=mx set upper right corner of region to
histogram in (x,y) space. If MAX is not given then
the arrays are searched for their max values. If MAX
is scalar or 1 element array that value is applied to
both x and y. To set both x and y maximums separately
send MAX as the 2 element array [xmax, ymax].
BIN=bn sets the histogram bin widths. If BIN is a
scalar or a single element array then it is applied
to both x and y. To set both x and y bins separately
send BIN as the 2 element array [xbin, ybin].
If BIN is not given then a value is chosen to give
roughly 200 bins in both x and y.
/LIST lists the x and y ranges and bin sizes used
to compute the 2-d histogram.
OUT=out Returned structure with x and y axes arrays
and x and y bin widths.

Outputs

h2d = The computed 2-d histogram of x and y. out

Common Blocks

array_map_com

Modification History

R. Sterner, 24 May, 1991.
R. Sterner, 2005 Jan 04 --- Added new keyword OUT.
Copyright (C) 1991, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.

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