Change variable name in plot

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Gabriele Curcio 2022-5-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1712075-change-variable-name-in-plot

编辑： Stephen23 2022-5-5

采纳的回答： Constantino Carlos Reyes-Aldasoro

在 MATLAB Online 中打开

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'.

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Stephen23 2022-5-5

编辑：Stephen23 2022-5-5

在 MATLAB Online 中打开

"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})

See: https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

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 2022-5-5

Ok, I manage to get the expected result! Thank you very much

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采纳的回答

Constantino Carlos Reyes-Aldasoro 2022-5-5

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1712075-change-variable-name-in-plot#answer_957510

在 MATLAB Online 中打开

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