fgrayplot

Arguments

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]=my_surface(x,y)","z=x**2+y**2")
fgrayplot(t,t,my_surface,rect=[-2,-2,2,2])

See also

• grayplot — 2D plot of a surface 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