Returns the Jacobian.
J=uncprb_getvecjac(n,m,x,nprob)
a floating point integer, the number of variables, i.e. the size of x
a floating point integer, the number of functions, i.e. the size of fvec
a n x 1 matrix of doubles, the point where to compute J
a floating point integer, the problem number
a m x n matrix of doubles, the Jacobian matrix, dfi(x)/dxj, i=1,..,m , j=1, ..., n
It is an interface function which calls the function uncprb_getfunc (which selects appropriate test function based on nprob) with option=2 in order to return J, the vector.