The GCONTOUR Procedure

Example 4: Using Patterns and Joins

Procedure features:

	COUTLINE=
	CTEXT=
	JOIN
	PATTERN

Sample library member:

GR14N04

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This example demonstrates the differences between using lines and patterns to represent contour levels. It first uses a simple PLOT statement to generate the default output, which uses lines to represent contour levels.

As shown in the following output, the example then modifies the PLOT statement by specifying the PATTERN option, which uses patterns to distinguish between contour levels. Additional PLOT statement options outline filled areas in gray and specify green text for all text on the axes and in the legend.

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Finally, as shown by the following output, the example uses the JOIN option to combine the patterns in grid cells for the same contour level. Additional options enhance the plot by modifying the axes and framing the legend.

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libname reflib 'SAS-data-library'; goptions reset=global gunit=pct border cback=white colors=(black blue green red) ftext=swiss ftitle=swissb htitle=6 htext=4;

data reflib.swirl; do x= to 5 by 0.25; do y= to 5 by 0.25; if x+y=0 then z=0; else z=(x*y)*((x*x-y*y)/(x*x+y*y)); output; end; end; run;

title 'Simple Contour Plot'; footnote j=r 'GR14N04(a) ';

proc gcontour data=reflib.swirl; plot y*x=z; run;

title 'Representing Contour Levels with Patterns'; footnote j=r 'GR14N04(b) ';

proc gcontour data=reflib.swirl; plot y*x=z / pattern coutline=gray ctext=green; run;

title 'Joining the Patterns in a Contour Plot'; footnote j=r 'GR14N04(c) ';

axis1 label=none value=('' ' ' '0' ' ' '5') color=red width=3; axis2 label=none value=('' ' ' '0' ' ' '5') color=red width=3; legend frame;

proc gcontour data=reflib.swirl; plot y*x=z / pattern join haxis=axis1 vaxis=axis2 legend=legend1; run; quit;

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