PLOT <data> / TYPE=MATRIX
(with DEVICE=PS or DEVICE=G or as GPLOT)
makes a matrix plot of the active part of <data> as a raster image.
In the graph, the active variables appear as columns and active obser-
vations as rows. For each data value, a box with a color depending on
the value of the current variable in the current observation will be
drawn.
By default (NORM=C), the values are scaled by columns (i.e. separately for
each variable). Other alternatives are indicated by NORM=R (scaling
by rows) and NORM=T (uniform scaling over entire data).
After scaling, the highest values are set to 1 and lowest to 0.
These values are mapped to various colors or shades of gray (see
description in contour plots PLOTCONT?).
The color for missing values can be given by MISSING=x where 0<=x<=1.
Default is MISSING=0.
In matrix plots, the columns are labelled by names of active variables
and rows by names of cases as in HBAR plots (see PLOTBAR?).
The setting of labels is adjusted by specifications
ROWLABELS=1,<number_of_label_columns>,<max.length_of_label>
COLUMNLABELS=1,<number_of_label_rows>
In both specifications, the second parameter is an integer (default 1).
Its purpose is to give more space for otherwise too tight setting of
labels.
The labels are omitted completely by giving ROWLABELS=0, COLUMNLABELS=0.
Example:
................................................................................
DATA CHESS
_ C1 C2 C3 C4 C5 C6 C7 C8 _
R1 - 0 - 0 - 0 - 0 .2
R2 0 - 0 - 0 - 0 - .3
R3 - 0 - 0 - 0 - 0 .4
R4 0 - 0 - 0 - 0 - .5
R5 - 0 - 0 - 0 - 0 .6
R6 0 - 0 - 0 - 0 - .7
R7 - 0 - 0 - 0 - 0 .8
R8 0 - 0 - 0 - 0 - .9
_ .2 .3 .4 .5 .6 .7 .8 .9 1
GPLOT CHESS / TYPE=MATRIX NORM=T MODE=EGA
PALETTE=VGAGRAY MISSING=.1
ROWLABELS=[MAGENTA],1,4,2
COLUMNLABELS=[MAGENTA],1,2
................................................................................
P = More information on PLOT
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