MATLAB Answers

Looping through mulyiple variable with names+numbers

1 view (last 30 days)
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]];
%%%%%%%%%%%%%%%%%%%% 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]];
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!
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.

Sign in to comment.

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};





Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!