how to set a line with different color

No, it is not possible to have a single line object with segments of different colour. You have to have a new line object for each segment as per KSSV's example. Note that plot will return the array of line objects which you can pass as one variable to the other code that will act on it. You may have to modify slightly that other code so it can cope with a non-scalar object but it shouldn't be too arduous. e.g.:

x = linspace(0, 2*pi, 1000);
hlines = plot(reshape(x, [], 4), reshape(sin(x), [], 4))
[hlines.LineWidth] = deal(2);   %This is how to modify one of the property for all the lines at once
[hlines.LineStyle] = deal(':');

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yan zhang 2017-7-6

Thank you very much, you help me a lot!

Cloud1995 2018-4-8

It is an awesome solution to my problem. Thanks so much!

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更多回答（1 个）

KSSV 2017-7-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/347563-how-to-set-a-line-with-different-color#answer_273056

编辑：KSSV 2017-7-6

在 MATLAB Online 中打开

x1=[1:500];
y1=sin(0.2*x1);
x2=[501:1000];
y2=sin(0.2*x2);
figure
hold on
plot(x1,y1,'r')
plot(x2,y2,'b')
figure(2)
plot(x1,y1,'r',x2,y2,'b')

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KSSV 2017-7-6

When you use set the previous plot is over written. You can straight away use line as I have shown.

yan zhang 2017-7-6

在 MATLAB Online 中打开

Thanks a lot. I should draw the line which will change every few seconds, and different colors represent different states. If a line obj can have different color, The code

set(pl,'ydata',y);

will meet my request. I will try other ways to solve the problem.

Thanks again.

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