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Write a function to find the values of a design variable vector, *x*, that minimizes an unconstrained scalar objective function, *f*, given a function handle to *f* and its gradient, a starting guess, *x0*, a gradient tolerance, *TolGrad*, and a maximum number of iterations, *MaxIter*, using the Quasi-Newton (Secant) Method. Initialize the Hessian approximation as an identity matrix. Update the Hessian matrix approximation using the BFGS update formula.

20 correct solutions
22 incorrect solutions

Last solution submitted on May 13, 2015