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Divergence : divergence

divergence takes two arguments : a vector field of dimension n depending on n real variables.
divergence returns the divergence of F that is the sum of the derivative of the k-th component with respect to the k-th variable. For example in dimension n = 3:
divergence([A,B,C],[x,y,z])= $\displaystyle {\frac{{\partial A}}{{\partial x}}}$ + $\displaystyle {\frac{{\partial B}}{{\partial y}}}$ + $\displaystyle {\frac{{\partial C}}{{\partial z}}}$
Input :
Output :

giac documentation written by Renée De Graeve and Bernard Parisse