graypolarplot

Polar 2D plot of a surface using colors

Calling Sequence

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.

Sample

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)