grayplot

2D plot of a surface using colors

Calling Sequence

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

Arguments

: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. If z contains %nan values, the surounding rectangles are not displayed.

Enter the command grayplot() to see a demo.

Sample

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 2D plot of a surface defined by a function using colors
• plot2d 2D plot
• Sgrayplot smooth 2D plot of a surface using colors
• Sfgrayplot smooth 2D plot of a surface defined by a function using colors