*! version 1.0.1 16mar2010
help spmat graph

Title

spmat graph -- Draw an intensity plot of the
spatial-weighting matrix W contained in an spmat object

Syntax

spmat graph objname [, options]

Main
blocks([(stat)] p) plot matrix in
p x p blocks

Y axis, X axis, Titles, Legend, Overall
twoway_options any options other than by() documented
in [G] twoway_options

Description

spmat graph draws an intensity plot of the
spatial-weighting matrix W contained in the spmat object
objname. Zero elements are plotted in white; the remaining elements are
partitioned into 16 bins of equal length and assigned gray-scale colors
gs0-gs15; see [G] colorstyle.

Options

Main

blocks() divides the matrix into blocks of size p and plots
block maximums. To plot a statistic other than the default maximum,
specify the optional stat argument. For example, to plot block
medians, specify blocks((p50) p). The supported
statistics include those returned by summarize, detail; see
summarize for a complete list.

Y axis, X axis, Titles, Legend, Overall

twoway_options are any of the options documented in
[G] twoway_options, excluding by().
These include options for titling the graph
(see [G] title_options) and
for saving the graph to disk (see [G] saving_option).

Example

Setup

. spmat use cobj using pollute.spmat

Plot the contiguity matrix contained in the spmat object cobj
in 5 x 5 blocks

. spmat graph cobj, blocks(5)

Also see

Online: spmat, spreg, spivreg,
spmap, shp2dta, mif2dta (if installed)