polarplot

Arguments

rho

a vector, the radius values

theta

a vector with same size than rho, the angle values.

<opt_args>

a sequence of statements key1=value1, key2=value2, ... where keys may be style,leg,rect,strf or frameflag

style

is a real row vector of size nc. The style to use for curve i is defined by style(i). The default style is 1:nc (1 for the first curve, 2 for the second, etc.).

-

if style(i) is negative, the curve is plotted using the mark with id abs(style(i))+1; use xset() to see the mark ids.

-

if style(i) is strictly positive, a plain line with color id style(i) or a dashed line with dash id style(i) is used; use xset() to see the color ids.

-

When only one curve is drawn, style can be the row vector of size 2 [sty,pos] where sty is used to specify the style and pos is an integer ranging from 1 to 6 which specifies a position to use for the caption. This can be useful when a user wants to draw multiple curves on a plot by calling the function plot2d several times and wants to give a caption for each curve.

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. same as frameflag

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

polarplot creates a polar coordinate plot of the angle theta versus the radius rho. theta is the angle from the x-axis to the radius vector specified in radians; rho is the length of the radius vector specified in dataspace units. Note that negative rho values cause the corresponding curve points to be reflected across the origin.

Example 1

t= 0:.01:2*%pi;
clf();polarplot(sin(7*t),cos(8*t))

Example 2

t= 0:.01:2*%pi;

clf();polarplot([sin(7*t') sin(6*t')],[cos(8*t') cos(8*t')],[1,2])

Example 3

t = 0:0.01:2*%pi;
polarplot(t, -1 + sin(t));

Example 4

clf()
theta=[0:0.02:2*%pi]';
rho=1+0.2*cos(theta.^2)
polarplot(theta,rho,style=5)
a=gca()
a.isoview='on'
a.data_bounds=[-1.2,-1.2;1.2,01.2]