Change variable name in plot

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I have these variables as a double:
time; run_0; run_1; run_3; ...; run_23
how can I plot them without rewriting everytime the function plot?
The idea is:
for i = 0:23
plot(time, run_i); %index 'i' to change dynamically
hold on
end
I do not know how to write the index 'i'.
  7 Comments
Stephen23
Stephen23 on 5 May 2022
Edited: Stephen23 on 5 May 2022
"Yes I have imported these variables using LOAD."
Good, now we are getting somewhere. Always LOAD into an output variable:
S = load(..)
All of the loaded variables are fields of the scalar structure S. Note that you can easily obtain the fieldnames
C = fieldnames(S)
and then loop over them (or just generate them yourself e.g. using SPRINTF) and use dynamic fieldnames, for example to access the 2nd field of the structure:
S.(C{2})
How many variables are in each MAT file? (Or are you unfortunately using LOAD to import textfiles?)
Please upload your data files (two or three, not all) by clicking the paperclip button.
Gabriele Curcio
Gabriele Curcio on 5 May 2022
Ok, I manage to get the expected result! Thank you very much

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Accepted Answer

Constantino Carlos Reyes-Aldasoro
As mentioned before, this is not the best way to handle your data, BUT you are where you are, so to be able to use the names run_0, run_1, etc you need to concatenate strings:
for i =0:10
name = strcat('run_',num2str(i))
end
name = 'run_0'
name = 'run_1'
name = 'run_2'
name = 'run_3'
name = 'run_4'
name = 'run_5'
name = 'run_6'
name = 'run_7'
name = 'run_8'
name = 'run_9'
name = 'run_10'
Further, do not use i for a counter, i can be used for imaginary numbers, better to use a sensible name like "counterRuns" or something that has a meaning.
Hope this solves your problem
  1 Comment
Stephen23
Stephen23 on 5 May 2022
Edited: Stephen23 on 5 May 2022
"...you need to concatenate strings"
A more efficient approach is to use SPRINTF:
sprintf('run_%d',i)
or use the STRING class:
"run_" + i

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