The G3GRID Procedure

Example 4: Spline Interpolation

Procedure features:

GRID statement options:

	AXIS1=
	AXIS2=
	SPLINE

Data set:

NUMS (see Using the Default Interpolation Method)

Sample library member:

GTGSPLIN

This example demonstrates the default interpolation method when used by the GCONTOUR procedure to generate a contour plot from the resulting output data set.

Contour Plot Using Default Interpolation (gtgsplin)

[A Contour Plot Generated After Default Interpolation]

The second plot, demonstrates the spline interpolation method when used by the GCONTOUR procedure to generate a contour plot from the resulting output data set.

Contour Plot Using Spline Interpolation (gtgsplin)

[A Contour Plot Generated After Spline Interpolation]

goptions reset=all border;

title "Contour Plot using Default Interpolation";

axis1 width=3;

proc g3grid data=nums out=numdef;
   grid y*x=z /
      axis1=-5 to 5 by .5
      axis2=-5 to 5 by .5;
   run;

proc gcontour data=numdef;
   plot y*x=z / 
      haxis=axis1 
      vaxis=axis1;
   run;
quit;

title "Contour Plot using Spline Interpolation";

proc g3grid data=nums out=numspl;
   grid y*x=z / spline
                axis1=-5 to 5 by .5
                axis2=-5 to 5 by .5;
run;

proc gcontour data=numspl;
   plot y*x=z / 
      haxis=axis1 
      vaxis=axis1;
   run;
quit;

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