Use of polarplot function in MATLAB

Catalog

grammar

explain

Example

Create a polar chart

Convert from degrees to radians before drawing

Draw multiple lines in polar coordinates

Draw radius values at equally spaced angles  

Draw negative radius values  

Specify the line color of the polar chart

Specify line color after creation  

Use complex values to create polar charts  

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        polarplot The function draws lines in polar coordinates .

grammar

polarplot(theta,rho)
polarplot(theta,rho,LineSpec)
polarplot(theta1,rho1,...,thetaN,rhoN)
polarplot(theta1,rho1,LineSpec1,...,thetaN,rhoN,LineSpecN)
polarplot(rho)
polarplot(rho,LineSpec)
polarplot(Z)
polarplot(Z,LineSpec)
polarplot(___,Name,Value)
polarplot(pax,___)
p = polarplot(___)

explain

        polarplot(theta,rho) Draw lines in polar coordinates , from theta Represents the arc angle ,rho Represents the radius value of each point . The input must be a vector of equal length or a matrix of equal size . If the input is matrix ,polarplot Will draw rho The right of theta The graph of the columns of the . One input can also be a vector , The other is matrix , But the length of the vector must be equal to one dimension of the matrix .

        polarplot(theta,rho,LineSpec) Set the linetype of the line 、 Marking symbols and colors .

        polarplot(theta1,rho1,...,thetaN,rhoN) Draw multiple rho,theta Pair up .

        polarplot(theta1,rho1,LineSpec1,...,thetaN,rhoN,LineSpecN) Specify the linetype of each line 、 Marking symbols and colors .

        polarplot(rho) At equidistant angles （ Be situated between 0 and 2π Between ） draw rho Radius value in .

        polarplot(rho,LineSpec) Set the linetype of the line 、 Marking symbols and colors .

        polarplot(Z) draw Z Complex values in .

        polarplot(Z,LineSpec) Set the linetype of the line 、 Marking symbols and colors .

        polarplot(___,Name,Value) Use one or more Name,Value Specify the properties of the drawing line for the group parameter . Property settings apply to all lines . Can't use Name,Value Assign different attribute values to different lines for groups .

        polarplot(pax,___) Use pax designated PolarAxes object , Instead of using the current coordinate area .

        p = polarplot(___) Returns one or more drawing line objects . Use... After creating a drawing line object p Set properties for it . About the attribute list , see also Line attribute .

Example

Create a polar chart

         Draw lines in polar coordinates .

theta = 0:0.01:2*pi;
rho = sin(2*theta).*cos(2*theta);
polarplot(theta,rho)

         As shown in the figure ：

Convert from degrees to radians before drawing

         Create data to plot . 

theta = linspace(0,360,50);
rho = 0.005*theta/10;

         take theta The value in is converted from degrees to radians . Then plot the data in polar coordinates .

theta_radians = deg2rad(theta);
polarplot(theta_radians,rho)

         As shown in the figure ：

Draw multiple lines in polar coordinates

         Draw two lines in polar coordinates . The second line uses a dashed line .

theta = linspace(0,6*pi);
rho1 = theta/10;
polarplot(theta,rho1)

rho2 = theta/12;
hold on
polarplot(theta,rho2,'--')
hold off

         As shown in the figure ：

Draw radius values at equally spaced angles  

         Specify only the radius value , Do not specify an angle value .polarplot Will be at equidistant angles （ from 0 To 2π） Draw the radius value . A circular marker is displayed at each data point .

rho = 10:5:70;
polarplot(rho,'-o')

         As shown in the figure ：

Draw negative radius values  

         Use a negative radius value to create a polar chart . By default ,polarplot Reflects negative values through the origin .

theta = linspace(0,2*pi);
rho = sin(theta);
polarplot(theta,rho)

         As shown in the figure ：

change  r  The scope of the shaft , Make it from -1 To 1. 

rlim([-1 1])

         As shown in the figure ：

Specify the line color of the polar chart

         Create a polar chart with a red line marked with a circle .

theta = linspace(0,2*pi,25);
rho = 2*theta;
polarplot(theta,rho,'r-o')

         As shown in the figure ：

Specify line color after creation  

         Create a polar chart and return the drawing line object . 

theta = linspace(0,2*pi,25);
rho = 2*theta;
p = polarplot(theta,rho);

         As shown in the figure ：

         Change the line color and width and add a marker . 

p.Color = 'magenta';
p.Marker = 'square';
p.MarkerSize = 8;

         As shown in the figure ：

Use complex values to create polar charts  

         Draw complex values in polar coordinates . Show markers at each point , There is no connecting line between marks .

Z = [2+3i 2 -1+4i 3-4i 5+2i -4-2i -2+3i -2 -3i 3i-2i];
polarplot(Z,'*')

         As shown in the figure ：

theta - Angle value  

         Angle value , Specify as vector or matrix . Specify the radian value . To convert data from degrees to radians , Please use deg2rad.

         To change theta The scope of the shaft , Please use thetalim.

rho - Radius value

         Radius value , Specify as vector or matrix . By default , A negative value will reflect through the origin . The reflection of a point is achieved by taking the absolute value of its radius and increasing its angle 180 Degrees to achieve .

         To change r The scope of the shaft , Please use rlim.

Z - Complex values

         Complex values , Specify as vector or matrix , The form of each element is or x+iy, among ： 

• rho = sqrt(x^2+y^2)

• theta = atan(y/x)

LineSpec - Linetype 、 Marking and color

         Linetype 、 Marking and color , Specified as a character vector or string containing symbols . Symbols can be displayed in any order . You do not need to specify all three characteristics at the same time （ Linetype 、 Marking and color ）. for example , If you ignore linetype , Specify only tags , Then the plot displays only the marks , Do not show lines .

Linetype	explain	Lines representing
'-'	Solid line
'--'	Dotted line
':'	Dotted line
'-.'	Point line

Mark	explain	Generated tags
'o'	circle
'+'	plus
'*'	asterisk
'.'	spot
'x'	Cross
'_'	Horizontal lines
'|'	Vertical lines
's'	square
'd'	The diamond
'^'	Upper triangle
'v'	Lower triangle
'>'	Right triangle
'<'	Left triangle
'p'	Pentagonal
'h'	hexagon

Color name	Short name	RGB A triple	appearance
'red'	'r'	[1 0 0]
'green'	'g'	[0 1 0]
'blue'	'b'	[0 0 1]
'cyan'	'c'	[0 1 1]
'magenta'	'm'	[1 0 1]
'yellow'	'y'	[1 1 0]
'black'	'k'	[0 0 0]
'white'	'w'	[1 1 1]

pax - PolarAxes  object

        PolarAxes object . Can be set by PolarAxes Object properties to modify its appearance and behavior .

Tips

• ​ To convert data from degrees to radians , Please use  deg2rad. To convert data from radians to degrees , Please use  rad2deg.​

• ​ You can modify the polar area properties to customize the chart . About the attribute list , May refer to PolarAxes attribute .

• To plot additional data in the polar region , Please use hold on command . however , You cannot plot data that requires Cartesian coordinates in a polar chart .