how to calculate hessian matrix

[tomasdome]

hi, i'm trying to calculate the hessian matrix of a multivariable function
(f(x,y,z,r) for example),

how i can do it?

i'm trying to make him with 2 for statements and the function "diff" but i
think "diff" only accepts univariable functions like f(x).

sorry , i'm a newbie in Octave

thanks! :) 



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