How to get values out of a matrix equation, when one of its elements is an array?

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Zeyad Elsayed 2019-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/465033-how-to-get-values-out-of-a-matrix-equation-when-one-of-its-elements-is-an-array

评论： Zeyad Elsayed 2019-6-5

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Hello everyone,

My question is how can I solve a matrix equation, when one of its elements is an array?

This error comes up in the command window preventing 'q' to be found. "Dimensions of arrays being concatenated are not consistent."

% Stating variables
omega = 100
M_22 = (0:0.1:20);
C_22 = (0:0.2:40);
F_1 = (0:0.4:80);
% Creating Matrix
M = [1 0; 0 M_22];
C = [1 2; -2 C_22];
K = [100 0; 0 100];
F = [F_1; F_2];
% Equations
Z = -(omega^2)*M + omega*j*C + K;
Z_inverse = inv(Z);
q = Z_inverse*F;

Thanks in advance!

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Walter Roberson 2019-6-4

在 MATLAB Online 中打开

tvals = 0:0.1:20;
numt = length(tvals);
v3 = zeros(2, numt);
for tidx = 1 : numt
    t = tvals(tidx);
    ....
    v3(:, tidx) = q;
end

Zeyad Elsayed 2019-6-5

Perfect it worked! Thanks Walter, I want to Accept your answer but for some reason I cant find how to do this. Probably because its submitted as a comment.

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