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Aide de Scilab >> Graphiques > 2d_plot > grayplot

# grayplot

2D plot of a surface using colors

### Syntax

```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, logflag 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 surrounding rectangles are not displayed.

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)```

• fgrayplot — représentation 2D en pseudo-couleurs d'une surface définie par une fonction
• 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

### History

 Version Description 5.5.0 Option `logflag` introduced.