how to make a partial difference from multivariable function?

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armin mohsenpour 2015-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/258452-how-to-make-a-partial-difference-from-multivariable-function

评论： Walter Roberson 2015-12-2

phi = atan2(sin(psi)*sin(theta),cos(psi)+cos(theta)); %eq.(30)

i want to make a partial difference of phi(psi,theta) once into psi and once into theta. i use the "diff" funtion in form of "diff(phi,psi) and MATLAB gave me an long answer that contains of real and imaginary part. but i want a compeletly real answer.