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| 1 | #include "NLModel.hpp" | |
| 2 | #include <math.h> | |
| 3 | < | |
| 3 | > | #include "Utility.hpp" |
| 4 | /** | |
| 5 | * calculate gradient using backward finite difference | |
| 6 | * df(Xk)/dXi = (f(Xk) - f(Xk - h*ei)) /h | |
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