grayplot of a surface defined by a function  
Script:

deff('[z]=surf(x,y)','z=x**2+y**2');
fgrayplot(-1:0.1:1,-1:0.1:1,surf);
xtitle('fgrayplot ',' ',' ');

This demo draw the grayplot of a surface defined by a function
1.Send the script to the Server and receive the picture.
the window shows a piece of message.


the picture of the function

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