The PLOT Procedure

Example 7: Producing a Contour Plot

Procedure features:

PLOT statement option

CONTOUR=

This example shows how to represent the values of three variables with a two-dimensional plot by setting one of the variables as the CONTOUR variable. The variables X and Y appear on the axes, and Z is the contour variable. Program statements are used to generate the observations for the plot, and the following equation describes the contour surface:

[IMAGE]

Program

options nodate pageno=1 linesize=64 pagesize=25;

data contours;
   format Z 5.1;
   do X=0 to 400 by 5;
      do Y=0 to 350 by 10;
         z=46.2+.09*x-.0005*x**2+.1*y-.0005*y**2+.0004*x*y;
         output;
      end;
   end;
run;

proc print data=contours(obs=5) noobs;
   title 'CONTOURS Data Set';
   title2 'First 5 Observations Only';
run;

                       CONTOURS Data Set                       1
                   First 5 Observations Only

                            Z    X     Y

                         46.2    0     0
                         47.2    0    10
                         48.0    0    20
                         48.8    0    30
                         49.4    0    40

options nodate pageno=1 linesize=120 pagesize=60 noovp;

proc plot data=contours; plot y*x=z / contour=10; title 'A Contour Plot'; run;

Output

The shadings associated with the values of Z appear at the bottom of the plot. The plotting symbol # shows where high values of Z occur.

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The shadings associated with the values of Z appear at the bottom of the plot. The plotting symbol # shows where high values of Z occur.