How to change color of lines on legend?

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Mahdi Torabi
Mahdi Torabi 2018-7-14
评论： Walter Roberson 2020-5-1
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
Walter Roberson 2018-7-14
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
Mahdi Torabi 2018-7-14
Thank you so much. This solved the problem.

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采纳的回答

Mahdi Torabi
Mahdi Torabi 2018-7-14
编辑：Matt J 2018-7-14
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'})
  2 个评论
Matt J
Matt J 2018-7-14
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
Walter Roberson 2018-7-15
Turns out you just need
hold on
to be in effect, as otherwise the second plot() clears the axes.

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更多回答（1 个）

Matt J
Matt J 2018-7-14
编辑：Matt J 2018-7-14
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')
  2 个评论
Luiz Bacelar
Luiz Bacelar 2020-5-1
how to solve this? I have similar problem
Walter Roberson
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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