How can i make a matrix with variables from workspace.

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Márcis Pinups
Márcis Pinups on 29 Oct 2021
Answered: Kshitij Chhabra on 3 Nov 2021
I have made a matrix and saved the matrix lines seeratly, as for example: line1, line 2, line 3
How can I write a for loop for creating a matrix, where the programm asks which lines i want o include in my new matrix.
%Those lines are saved as a vector
line1=simulink_matrix(1,:);
line2=simulink_matrix(2,:);
line3=simulink_matrix(3,:);
  1 Comment
Stephen23
Stephen23 on 29 Oct 2021
The MATLAB approach is to use an index:
idx = [2,4,11]; % indices of the rows you want
out = simulink_matrix(idx,:);
Your current approach (with lots of numbered variables) will make this task slow, complex, and very inefficient.

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Answers (1)

Kshitij Chhabra
Kshitij Chhabra on 3 Nov 2021
Hi Marcais,
As Stephen mentioned in one of the comments, creation of numbered variables would be an in-efficient approach. However as you mentioned that, you want the program to ask the lines which you want to include in the output, I can recommend using the "input" keyword inside a for loop and then perform the related options accordingly. You can check the follwing code for reference
You can check the documentation for input here.

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