How to add multiple legends in a loop for mulitple plots?

Question

Naif Alsalem 2022-11-13

评论： Naif Alsalem 2022-11-13

Hi there,

I have, say, 3 plots generated in a loop like the following:

for r=1:3
   figure;
   px= vardata(:,250, r);
   plot(px,'-', 'color',rand(1,3)); 
end 

Now, I need to add legends to each plot as pixel 1, pixel 2, pixel 3 etc automaticlally.

I am used to add legends manually and have not worked on adding legends in a loop before.

Many Thanks

Answer 1

Walter Roberson 2022-11-13

for r=1:3
   figure;
   px= vardata(:,250, r);
   plot(px,'-', 'color',rand(1,3), 'DisplayName', "pixel " + r);
   legend show
end

However since you are only displaying one line per figure window, normally you would use a title() instead of legend()

Naif Alsalem 2022-11-13

Many thanks @Walter Roberson, for the answer and suggestion. Yes title for one-line plot is really helpful.

Thanks again.

Cheers,