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Why can't I add plots to axes after creating a legend?

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Avishek  Mondal
Avishek Mondal am 8 Jul. 2017
Geschlossen: MATLAB Answer Bot am 20 Aug. 2021
I was following the instructions here https://uk.mathworks.com/help/matlab/ref/legend.html. However, when I run the following code (is the same as one provided in the link) -
x = linspace(0,10);
y1 = sin(x);
plot(x,y1)
legend('First Line')
hold on
y2 = cos(x);
plot(x,y2,'DisplayName','Second Line')
I get the attached graph. Could someone please tell me why this is happening? Thank you!

Antworten (1)

Image Analyst
Image Analyst am 8 Jul. 2017
legend() does not automatically update when you add stuff. How could it know what you want to call the additional curves? I don't know what the 'DisplayName' option is in plot(). My R2017a help for plot does not mention that as a possible option. Is that what you thought legend() would automatically use? Evidently not. You'll have to call legend after you're all done plotting curves, not before then.

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