Creation of a legend of a graph with a for loop

I have a graph containing different curves obtained at different velocities and I need a legend linking each curve to the relative velocity at which it has been obtained. Can I create the legend of the graph with this kind of loop without typing an infinite line containing the values of all the velocities?

for l=1:length(v)
 legend([num2str(v(l)),'m/s '])
end

Answer 1

[Star Strider]

The problem description is a bit difficult to interpret, however there are at least two possible solutions (if I interpret it correctly).

The first is described in the legend documentation section on Specify Legend Labels During Plotting Commands

The second is described in the legend documentation on Included Subset of Graphics Objects in Legend

I believe one of these (if not both) should work. If there are problems, post back.

Note that the 'DisplayName' option also permits using sprintf to change the display name appropriately with respect to the numeric arguments in the plot call.

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[Emilio Pulli]

I try to be clearer... I have a matrix 15x100 that I have to plot as a function of vector 1x100. Each row of the matrix corresponds to a curve obtained at a certain velocity. Therefore I will obtain 15 different curves. I need a legend that specify the velocity at which each curve is obtained without writing a long legend line containing all the values of the velocities.

[Star Strider]

This could be an illustration of the solution —

x = linspace(0, pi, 500);
v = linspace(1, 5, 15);
y = 20*v(:)+10*exp(-v(:)*x) .* sin(v(:)*x*2*pi);

figure
hold on
for k = 1:size(y,1)
plot(x, y(k,:), 'DisplayName',sprintf('v = %.2f',v(k)))
end
hold off
grid
legend('Location','bestoutside')

Experiment to get the desired results.

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[Emilio Pulli]

Thanks man, really really appreciated!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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