How to change color of lines on legend?

Question

Mahdi Torabi 2018-7-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410388-how-to-change-color-of-lines-on-legend

评论： Walter Roberson 2020-5-1

采纳的回答： Mahdi Torabi

Is there any way to change the color of lines in the legend AFTER plotting the graph(like using Edit\axes properties)?

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Walter Roberson 2018-7-14

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You could record the handle of the first of each type, and then pass that vector of handles as the first argument to legend().

Or you could do something like

L(1) = plot(nan, nan, 'b-');
L(2) = plot(nan, nan, 'r--');
legend(L, {'first case', 'second case'})

Mahdi Torabi 2018-7-14

Thank you so much. This solved the problem.

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Answer 1

Mahdi Torabi 2018-7-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410388-how-to-change-color-of-lines-on-legend#answer_328876

编辑：Matt J 2018-7-14

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According to the Walter answer on above my problem solved easily using :

L(1) = plot(nan, nan, 'b-');
L(2) = plot(nan, nan, 'r--');
legend(L, {'first case', 'second case'})

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Matt J 2018-7-14

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This gives an error,

Error using legend>process_inputs (line 554)
Invalid argument. Type 'help legend' for more information.
Error in legend>make_legend (line 306)
[autoupdate,orient,location,position,children,listen,strings,propargs] = process_inputs(ha,argin); %#ok
Error in legend (line 259)
    make_legend(ha,args(arg:end),version);

Walter Roberson 2018-7-15

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Turns out you just need

hold on

to be in effect, as otherwise the second plot() clears the axes.

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Answer 2

Matt J 2018-7-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410388-how-to-change-color-of-lines-on-legend#answer_328878

编辑：Matt J 2018-7-14

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This might be what Walter meant,

t=linspace(0,1,10);
L(1:2) = plot(t,exp(-t), 'r--',nan,nan,'k--');hold on
L(3:4) = plot(t,1-exp(-t), 'g^-',nan,nan,'m^-'); hold off
legend(L([2,4]), 'Red','Green')

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Luiz Bacelar 2020-5-1

how to solve this? I have similar problem

Walter Roberson 2020-5-1

plot(nan,nan) with appropriate line style and color, once for each different thing you want to appear in the legend, recording the handle that is returned. Then when you call legend(), pass that array of handles in as the first parameter to legend()

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