fgrayplot - 2D plot of a surface defined by a function using colors

Calling Sequence

fgrayplot(x,y,f,[strf,rect,nax])

fgrayplot(x,y,f,<opt_args>)

Parameters

• x,y : real row vectors.
• f : external of type y=f(x,y).
• <opt_args> : This represents a sequence of statements key1=value1, key2=value2,... where key1, key2,... can be one of the following: rect, nax, strf or axesflag and frameflag (see plot2d).
• strf,rect,nax : see plot2d.

Description

fgrayplot makes a 2D plot of the surface given by z=f(x,y) on a grid defined by x and y. Each rectangle on the grid is filled with a gray or color level depending on the average value of z on the corners of the rectangle.

Enter the command fgrayplot() to see a demo.

Examples

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

See Also

grayplot  plot2d  Sgrayplot  Sfgrayplot  

Author

J.Ph.C.