grayplot

grayplot

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`).
`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);
xbasc()
grayplot(t,t,m)

See also

fgrayplot, plot2d, Sgrayplot, Sfgrayplot

Author

J.Ph.C.