How do I calculate partial derivatives numerically for a multi dimensional function?

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Hamid Attar
Hamid Attar 2020-5-17
Hello,
I have a 6 dimentional function, which is a trained Gaussian process regression model obtained using the Regression Learner Matlab app.
I want to calculate the particual detivatives numerically with respect to each of the dimentions.
How can I do this, when the function is of the form trainedModel.predictFcn(x), where x is the 6 dimentional input vector?
Many thanks!
p.s. the reason I want to do this, is to use the Newton Raphson method to solve the equation f(x)=Y, please see my other question here if you can kindly give any further help:
https://uk.mathworks.com/matlabcentral/answers/526197-how-can-i-find-the-solution-to-a-multi-dimensional-struct-function-in-matlab

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