MATLAB Curve fitting with custom equation (max/min)
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Walter Roberson on 10 Jan 2022
You can bind it in using an anonymous function; http://www.mathworks.com/help/matlab/math/parameterizing-functions.html
However, I wonder if it is worth doing?
y = A*sin(x) + k %with known k
y - k = A * sin(x)
A = (y - k) ./ sin(x)
and for fitting purposes, the best A would be mean() of the right hand side.