How to dynamically create and update a legend ?

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Hi to all,
I have a simple script that:
  1. loads a *.mat file with a specific name and which is placed in the project directory
  2. plots a figure according to data/variables within the same *.mat file
the above two steps are cycled (inside a "for") and repeated 5 times. I use "hold on" so as to plot the 5 different figures inside the same window/plot.
At the end of my script I get a single window with 5 overlayed plots...which are unfortunately quite tricky to identify one from the other.
Script demo as follows:
for h=1:5;
filename = sprintf('file_%03d.mat', h);
load(filename);
cdfplot (file_gnd);
hold on;
So, I would like to add a legend and give a name to the different curves. The name in the legend should be simply the name of the *.mat file I load before and I am getting data from. So, in my example I should have a legend with labels "file_001.mat", "file_002.mat" and so on (according to 'h' range). My idea would be to create the legend inside the cycle and then populate it for each run of the cycle but it is not working since I am not able to give "legend" a dynamic parameter which is a function of 'filename' (and thus 'h' in my case).
Any idea ?

Accepted Answer

Majid Farzaneh
Majid Farzaneh on 24 May 2018
Edited: Majid Farzaneh on 24 May 2018
Hi, You don't have to create legend dynamically, Do it out of loop like this:
for h=1:5;
filename = sprintf('file_%03d.mat', h);
load(filename);
cdfplot (file_gnd);
hold on;
end
legend('file_001.mat', 'file_001.mat', 'file_001.mat', 'file_001.mat', 'file_001.mat');
legend assigns labels respectively. If you are not sure about this, you can test this code:
x=0:0.01:2*pi;
plot(sin(x));
hold on
plot(cos(x));
hold on
plot(sqrt(x))
legend('sin','cos','sqrt')
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