Clear Filters
Clear Filters

How to tune matrices to specific output?

1 view (last 30 days)
Hey guys. So I have four matrices that are each 8 by 8: matrix P, matrix Q, matrix R, and matrix G. I have a certain algorithm (I wont go in to too much details about it because its too complicated with multiple files) that depends on those four matrices and uses them to output a single column of values for me. I also have what I call the perfect output, which is what I desire the output single column to look like. Now my question is: How can I use MATLAB to tune those 4 matrices in order for the output column to match the perfect output column?
Sam Chak
Sam Chak on 26 Sep 2023
The code is looking good. 👍
% Initialize P, Q, R, G
P = [0.5 2.5; 3.5 1.5];
Q = P;
R = Q;
G = R;
perfectoutput = [1; 81; 256; 16];
x0 = cat(3, P, Q, R, G);
lsqnonlin(@(x) computeOutput(x(:,:,1), x(:,:,2), x(:,:,3), x(:,:,4)) - perfectoutput, x0)
Warning: Trust-region-reflective algorithm requires at least as many equations as variables; using Levenberg-Marquardt algorithm instead.
Local minimum found. Optimization completed because the size of the gradient is less than 1e-4 times the value of the function tolerance.
ans =
ans(:,:,1) = 1.0000 4.0000 3.0000 2.0000 ans(:,:,2) = 1.0000 4.0000 3.0000 2.0000 ans(:,:,3) = 1.0000 4.0000 3.0000 2.0000 ans(:,:,4) = 1.0000 4.0000 3.0000 2.0000
function output = computeOutput(P, Q, R, G)
M = P.*Q.*R.*G;
output = [M(1); M(2); M(3); M(4)];

Sign in to comment.

Accepted Answer

Bruno Luong
Bruno Luong on 26 Sep 2023
Edited: Bruno Luong on 26 Sep 2023
Use lsqnonlin (or such) if you have optimization toolbox.

More Answers (0)


Find more on Creating and Concatenating Matrices in Help Center and File Exchange




Community Treasure Hunt

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

Start Hunting!