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Scilab help >> Graphics > 2d_plot > fgrayplot

# 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>)```

### 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])```

• 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

J.Ph.C.