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# 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)

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