using a variable to call another variable
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Hello all,
After doing analysis in some other software I get text files namely Eigen_1.txt, Eigen_2.txt.......Eigen_k.txt and each file is 4x4 matrix. I want to read each file, get the (1,3) value and assign it to variable T1_1, T1_2.......T1,k and then use this value to get omega1_1 and so on. I have used eval command which works fine, but is there any other way to solve this without using eval command.
for n = 1:k
temp = readmatrix(strcat('.\Results\Eigen_',num2str(n),'.txt'),'delimiter',' ');
eval(['T1_',num2str(n),'=temp(1,3)']);
eval(['omega1_',num2str(n),' = 6.2832/T1_',num2str(n),]);
end
4 个评论
Stephen23
2022-9-16
"I have used eval command which works ..."
not very well: dynamically accessing variable names like that requires writing code which is slow, inefficient, insecure, obfuscated, buggy and hard to debug:
"...but is there any other way to solve this without using eval command."
The name MATLAB comes from MATrix LABoratory, so the simple and obvious solution is to use matrices, just like MATLAB is designed for. This is exactly what the introductory tutorials show too:
Irshad Qureshi
2022-9-16
Stephen23
2022-9-16
Irshad Qureshi
2022-9-16
采纳的回答
T1 = zeros(k, 1); % use array instead of T1_, T1_2, ...
omega1 = zeros(k, 1);
for n = 1:k
temp = readmatrix(strcat('.\Results\Eigen_',num2str(n),'.txt'),'delimiter',' ');
% eval(['T1_',num2str(n),'=temp(1,3)']);
% eval(['omega1_',num2str(n),' = 6.2832/T1_',num2str(n),]);
T1(n) = temp(1, 3);
omega1(n) = 2*pi/T1(n);
end
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