Write a function to return the value of Rosenbrock's two-dimensional banana function, as well as it's gradient (column) vector and Hessian matrix, given a vector of it's two independent variables x1 and x2. Here's the Rosenbrock function:
100*[(x2-x1^2)^2] + (1-x1)^2
@Robert, can you please verify that the last test case is correct?
I corrected a typo, checked the "Restore all solutions" box, and clicked "Save." Not sure how to tell when they're rescored.
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