# How to use legend command

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Sameer el 27 de Mayo de 2014
Comentada: Mahdi el 27 de Mayo de 2014
Hello all
I am having the data lets say for seven elements and I am ploting it using a loop in a single figure. But in these seven elements someof the elements contain nothing and then the plot for that is not plotted. Now how I can use the legend command only for the elements that are plotted?
Regards
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Mahdi el 27 de Mayo de 2014
Is the loop still telling the figure to plot even if there isn't any data recorded? You have a few ways around it:
The first one basically tells the legend to put an "empty" headline for the second item (if nothing was plotted)
legend('item1', '', 'item3')
You can also only tell MATLAB to plot only when there is data with
if isempty(your_matrix)~=1
plot(x,y)
end
There are also other ways which you can tell the legend to ignore some entries. You can also enter the plot tools (in the top menu of figure) and do it without code.
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Sameer el 27 de Mayo de 2014
Hi...thanks,it should be OR...can you tell me how i can form the loop for legend as ´there will be a lot of data and thus I want a generalization such as sprintf('Element%',p). but I amnot able to generate a loop that work with legend. Please Guide I am a newbie to matlab.
Regards
Mahdi el 27 de Mayo de 2014
Do you mean that you want the legend to be labelled differently based on the loop?
You can simply do something like this: (this is just an example)
for i=1:3
figure(i)
var1=sprintf('Plot_%d', i)
legend(var1)
end
In this case, the legend would show Plot_1, Plot_2, Plot_3

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