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Looping through mulyiple variable with names+numbers

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Ansaar Dada
Ansaar Dada on 17 Mar 2021
Answered: Mohammad Sami on 17 Mar 2021
Hi everyone,
Been trying to use a for loop for my 25+ variables, but to no avail. Please have a look at this snippet of a code:
%%%%%%%%%%%%%%%%%%%% working code
nb_iterations = 5;
A1rms = 230; P1rad = 0;
A3rms = 0*A1rms; P3rad = 0;
A5rms = [0:0.00775:0.031]*A1rms; P5rad = 0;
A7rms = [0:0.00695:0.0278]*A1rms; P7rad = pi;
A9rms = 0*A1rms; P9rad = 0;
V_As = []; V_Ps = [];
for tr = 1:nb_iterations
A3rms_int = rand(1)*max(A3rms);
A5rms_int = rand(1)*max(A5rms);
A7rms_int = rand(1)*max(A7rms);
A9rms_int = rand(1)*max(A9rms);
V_As = [V_As; [A3rms_int, A5rms_int, A7rms_int, A9rms_int]];
P3rad_int = rand(1)*P3rad;
P5rad_int = rand(1)*P5rad;
P7rad_int = rand(1)*P7rad;
P9rad_int = rand(1)*P9rad;
V_Ps = [V_Ps; [P3rad_int, P5rad_int, P7rad_int, P9rad_int]];
end
%%%%%%%%%%%%%%%%%%%% efficient code (not working)
selected_harm = 3:2:9;
for tr = 1:nb_iterations
for idx = length(selected_harm)
A(idx)rms_int = rand(1)*max(A(idx)rms);
V_As = [V_As; [A3rms_int, A5rms_int, A7rms_int, A9rms_int]];
P(idx)rad_int = rand(1)*P(idx)rad;
V_Ps = [V_Ps; [P3rad_int, P5rad_int, P7rad_int, P9rad_int]];
end
end
The first code works, but I would like to have a loop that performs A3rms_int all the way to A9rms_int in order to increase readability and be more efficient as I have variables all the way up to A25rms_int. And similarly, for the P variables.
Thank you in advance for your help!
  2 Comments
Rik
Rik on 17 Mar 2021
Mohammad, please move your comment to the answer section.
This issue is due to poor design. You should not store information in a variable name, that is what you have variables for.

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Answers (1)

Mohammad Sami
Mohammad Sami on 17 Mar 2021
You should use cell arrays to store your data. For example.
Arms = cell(25,1);
for i=1:2:25
Airms = Arms{i};
end

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