what is phi in matlab

In MATLAB, phi usually refers to the golden ratio (φ) which is approximately 1.61803. It can be computed using the following equation:

main.m
phi = (1 + sqrt(5))/2;
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Alternatively, if you have the Symbolic Math Toolbox installed, you can use the phi function to obtain the value of the golden ratio:

main.m
phi = phi
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This will return the value of phi as a symbolic number.