How to remove some parts of a Matlab plot?

Question

Pooya Zeg 2021-4-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/791354-how-to-remove-some-parts-of-a-matlab-plot

评论： Star Strider 2021-4-3

Hello,

I just wanted to know if it is possible to remove some parts of a Matlab plot. The solution is the specified region and below is the code,

clc;
clear;
close all;
w = -pi:0.01:pi;
r1 = 3;
r2 = 4;
x1 = 2.5;
y1 = -2;
x2 = 1;
y2 = 0.5;
x11 = x1+r1*cos(w);
y11 = y1+r1*sin(w);
x22 = x2+r2*cos(w);
y22 = y2+r2*sin(w);
x = -5:0.01:5;
yy1 = x-2;
yy2 = -x+2;
plot(x11,y11,'r',x22,y22,'b',x,yy1,'k',x,yy2,'k')
grid on
axis square

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Answer 1

Star Strider 2021-4-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/791354-how-to-remove-some-parts-of-a-matlab-plot#answer_665759

在 MATLAB Online 中打开

Try this:

w = -pi:0.01:pi;
r1 = 3;
r2 = 4;
x1 = 2.5;
y1 = -2;
x2 = 1;
y2 = 0.5;
x11 = x1+r1*cos(w);
y11 = y1+r1*sin(w);
x22 = x2+r2*cos(w);
y22 = y2+r2*sin(w);
x = -5:0.01:5;
yy1 = x-2;
yy2 = -x+2;
inred1 = inpolygon(x,yy1,x11,y11);
inred2 = inpolygon(x,yy2,x11,y11);
inblu1 = inpolygon(x,yy1,x22,y22);
inblu2 = inpolygon(x,yy2,x22,y22);
yy1(inred1 & inblu1) = NaN;
yy2(inred2 & inblu2) = NaN;
figure
plot(x11,y11,'r',x22,y22,'b',x,yy1,'k',x,yy2,'k')
grid on
axis equal

producing:

I changed the axis call to make the circles appear round.

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Pooya Zeg 2021-4-3

Great! Thanks. It worked. I'm just wondering if this can also work for "contour."

Star Strider 2021-4-3

As always, my pleasure!

With contour, likely not directly. It would be necessary to get the individual contours (difficult, hoiwever not impossible) and plot them separately, along with any other lines. Then a similar approach would likely work.

Note that contours, at least in my experience, do not overlap as the circles do here, so I have no idea how that would apply.

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