极坐标图的范围设置，只展示设置范围的扇形图

在学习MATLAB过程中使用极坐标画图时，图都是一个圆，而且不能放大，有时不需要全部范围的图，只需要局部范围，记录一下使用技巧

常规极坐标图：

clc;
close all
clear

y=50*sin((0.1:0.1:10)*pi)+100;
x=50*cos((0.1:0.1:10)*pi)+100;
for i=1:100
r = sqrt(x(i)^2+y(i)^2);%距离
e = atan2(y(i),x(i));%角度
zy(:,i) = [r,e]';
end
figure
polarplot(zy(2,:),zy(1,:));

限制范围极坐标图：

clc;
close all
clear

y=50*sin((0.1:0.1:10)*pi)+100;
x=50*cos((0.1:0.1:10)*pi)+100;
for i=1:100
r = sqrt(x(i)^2+y(i)^2);
e = atan2(y(i),x(i));
zy(:,i) = [r,e]';
end
figure
polarplot(zy(2,:),zy(1,:));
thetalim([0,90]); %修改此处，决定扇形区域

极坐标刻度（角度）

clc;
close all
clear

y=50*sin((0.1:0.1:10)*pi)+100;
x=50*cos((0.1:0.1:10)*pi)+100;
for i=1:100
r = sqrt(x(i)^2+y(i)^2);
e = atan2(y(i),x(i));
zy(:,i) = [r,e]';
end
figure
polarplot(zy(2,:),zy(1,:));
thetalim([0,90]); %修改此处，决定扇形区域
thetaticks(0:45:90)%thetaticks(最小刻度:间隔:最大刻度)

 角度显示为pi

clc;
close all
clear

y=50*sin((0.1:0.1:10)*pi)+100;
x=50*cos((0.1:0.1:10)*pi)+100;
for i=1:100
r = sqrt(x(i)^2+y(i)^2);
e = atan2(y(i),x(i));
zy(:,i) = [r,e]';
end
figure
polarplot(zy(2,:),zy(1,:));
thetalim([0,90]); %修改此处，决定扇形区域
thetaticks(0:15:90)%thetaticks(最小刻度:间隔:最大刻度)
pax = gca;
pax.ThetaAxisUnits = 'radians';  %角度显示为pi

极坐标半径设置

clc;
close all
clear

y=50*sin((0.1:0.1:10)*pi)+100;
x=50*cos((0.1:0.1:10)*pi)+100;
for i=1:100
r = sqrt(x(i)^2+y(i)^2);
e = atan2(y(i),x(i));
zy(:,i) = [r,e]';
end
figure
polarplot(zy(2,:),zy(1,:));
thetalim([0,90]); %修改此处，决定扇形区域
thetaticks(0:15:90)%thetaticks(最小刻度:间隔:最大刻度)
pax = gca;
pax.ThetaAxisUnits = 'radians';  %角度显示为pi
rlim([0 200])                                         % 设置半径范围
rticks([50 100 200])                                  % 在r = 50,100,200处显示刻度
rticklabels({'r = 50','r = 100','r = 200'})            % 在刻度线处加标记