calculate the condition number of a matrix in matlab

To calculate the condition number of a matrix in MATLAB, you can use the cond function. Here's an example:

main.m
A = [1, 2, 3; 4, 5, 6; 7, 8, 9];  % example matrix
cond_A = cond(A);  % calculate the condition number of A
disp(cond_A);  % display the condition number
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The cond function returns the condition number of a matrix, which is a measure of how sensitive the solution of a linear system is to changes in the matrix.

Note that the condition number is always a non-negative value, where higher values indicate a more ill-conditioned matrix (more sensitive to changes). A condition number close to 1 indicates a well-conditioned matrix.