Name

graypolarplot — Polar 2D plot of a surface using colors

Calling Sequence

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

Parameters

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)