how to calculate the trace of a matrix in matlab

To calculate the trace of a matrix in MATLAB, we can use the built-in function trace(). Here is an example code snippet:

main.m
% Define a matrix
A = [1 2 3; 4 5 6; 7 8 9];

% Calculate the trace
trA = trace(A);
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In this example, we define a 3x3 matrix A, and then compute its trace using the trace() function. The resulting trace value is stored in the variable trA.