grayplot - 2D plot of a surface using colors

Calling Sequence

grayplot(x,y,z,[strf,rect,nax])

grayplot(x,y,z,<opt_args>)

Parameters

• x,y : real row vectors of size n1 and n2.
• z : real matrix of size (n1,n2). z(i,j) is the value of the surface at the point (x(i),y(j)).
• <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 and plot2d_old_version ).
• strf,rect,nax : see plot2d .

Description

grayplot makes a 2D plot of the surface given by z 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 grayplot() to see a demo.

Examples

x=-10:10; y=-10:10;m =rand(21,21);
grayplot(x,y,m,rect=[-20,-20,20,20])
t=-%pi:0.1:%pi; m=sin(t)'*cos(t);
clf()
grayplot(t,t,m)
 
  

See Also

fgrayplot ,   plot2d ,   Sgrayplot ,   Sfgrayplot ,  

Author

J.Ph.C.