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Справка Scilab >> Графики > 2d_plot > graypolarplot

# graypolarplot

Polar 2D plot of a surface using colors

### Syntax

`graypolarplot(theta,rho,z,[strf,rect])`

### Arguments

theta

a vector with size n1, the discretization of the the angle in radian.

rho

a vector with size n2, the discretization of the radius

z

real matrix of size (n1,n2). `z(i,j)` is the value of the surface at the point (theta(i),rho(j)).

strf

is a string of length 3 `"xy0"`.

default

The default is `"030"`.

x

controls the display of captions.

x=0

no captions.

x=1

captions are displayed. They are given by the optional argument `leg`.

y

controls the computation of the frame.

y=0

the current boundaries (set by a previous call to another high level plotting function) are used. Useful when superposing multiple plots.

y=1

the optional argument `rect` is used to specify the boundaries of the plot.

y=2

the boundaries of the plot are computed using min and max values of `x` and `y`.

y=3

like `y=1` but produces isoview scaling.

y=4

like `y=2` but produces isoview scaling.

y=5

like `y=1` but `plot2d` can change the boundaries of the plot and the ticks of the axes to produce pretty graduations. When the zoom button is activated, this mode is used.

y=6

like `y=2` but `plot2d` can change the boundaries of the plot and the ticks of the axes to produce pretty graduations. When the zoom button is activated, this mode is used.

y=7

like `y=5` but the scale of the new plot is merged with the current scale.

y=8

like `y=6` but the scale of the new plot is merged with the current scale.

leg

a string. It is used when the first character x of argument `strf` is 1. `leg` has the form `"leg1@leg2@...."` where `leg1`, `leg2`, etc. are respectively the captions of the first curve, of the second curve, etc. The default is `""`.

rect

This argument is used when the second character y of argument `strf` is 1, 3 or 5. It is a row vector of size 4 and gives the dimension of the frame: `rect=[xmin,ymin,xmax,ymax]`.

### Description

Takes a 2D plot of the surface given by `z` on a polar coordinate grid defined by `rho` and `theta`. Each grid region if filled with a gray or color level depending on the average value of `z` on the corners of the grid.

### Examples

```rho=1:0.1:4;theta=(0:0.02:1)*2*%pi;
z=30+round(theta'*(1+rho.^2));
f=gcf();
f.color_map= hotcolormap(128);
clf();graypolarplot(theta,rho,z)```