legend inside a For loop

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Fabiano Da Mota
Fabiano Da Mota on 4 May 2019
Answered: Walter Roberson on 4 May 2019
Hello All,
I am trying to have a plot legend update after each iteration but I am having a hard time coming up with a solution. I have tried different techniques but nothing has worked so far.
Basically, I would like to have the legend print all values of "n". For example, Fin = n1, Fin=n2, etc. Using the provided code, I only get the legend for the last value of "n". Any suggestions would be greatly appreciated.
for n = 0:n_fins_inter:n_fins;
plot(array.Velocity_Plot(array.Nf_Plot==n),array.Pres_Drop_Plot((array.Nf_Plot==n)))
legend({sprintf('fin =%f\n',n)},'Location','southeast')
hold on
end
Thank you.

Answers (2)

Walter Roberson
Walter Roberson on 4 May 2019
for n = 0:n_fins_inter:n_fins;
dn = sprintf('fin =%f', n);
plot(array.Velocity_Plot(array.Nf_Plot==n),array.Pres_Drop_Plot((array.Nf_Plot==n)), 'DisplayName', dn);
hold on
end
legend('show', 'Location', 'southwest')

John Doe
John Doe on 4 May 2019
Edited: John Doe on 4 May 2019
Hello,
Not quite sure what your end goal is here, multiple figures with different legends or 1 figure with many legends.
To make multiple figures each with a different legend you can use a for loop like this.
% Multiple plots using for loop
ledgName = {'n1';'n2';'n3';'n4';'n5'}
for k = 1:1:5
figure(k)
plot(someData(:,k));
legend(sprintf('%s', ledgName{k}),'Location','southeast'))
end
To plot all of the data on the same figure you don't have to use a for loop. I have offered to options one with and without a for loop.
Tip: The legend should be outside of the for loop.
% Without a for loop
ledgName = {'n1';'n2';'n3'}
figure(1)
plot(xdata(:,1),ydata(:,1),xdata(:,2),ydata(:,2),xdata(:,3),ydata(:,3)) % and so on
legend(ledgName)
title('A Title')
xlabel('X Axis')
ylabel('Y Axis')
%With a for loop
figure(1)
hold on
ledgName = {'n1';'n2';'n3';'n4';'n5'}
for k = 1:5
plot(x,someData(:,k))
end
legend(ledgName)
% If you don't want to use a cell array for legend names then use this. But this is pointless
legend('N1','N2','N3')
To create a cell array for your legend using a for loop per your comment below:
for k = 1:8
names{k} = sprintf('N%d',k)
end
  3 Comments
John Doe
John Doe on 4 May 2019
Store your legends in a cell array and use a for loop to update the cell array if necessary.
Please accept the answer once you're happy. :)

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