Consider the following MATLAB code snippet for implementing Newton's method: while( norm(f(k)) > tol & k < maxk) d = feval(dfdx,x(k)); k = k + 1; x(k) = x(k-1) - f(k-1) / d; f(k) = feval(fnon,x(k)); end} Modify this code appropriately to implement the secant method instead. Assume that the vectors x and f contain the previous values xk and f(x).