polarplot

Plot polar coordinates

Calling Sequence

polarplot(theta,rho,[style,strf,leg,rect])
polarplot(theta,rho,<opt_args>)

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.

Sample

Example 1

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

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

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));