On return, jac contains the value of the Jacobian at the given point.
double array which contains the point at which the Jacobian is to be evaluated. The contents of this array must not be altered by this function. double matrix which, on return, contains the value of the Jacobian at x. The value of jac[i,j] is the derivative of f[i] with respect to x[j]. ZeroSystem.IJacobian Interface | Imsl.Math Namespace