update — SciPy v1.15.2 Manual (original) (raw)

scipy.optimize.HessianUpdateStrategy.

HessianUpdateStrategy.update(delta_x, delta_grad)[source]#

Update internal matrix.

Update Hessian matrix or its inverse (depending on how ‘approx_type’ is defined) using information about the last evaluated points.

Parameters:

delta_xndarray

The difference between two points the gradient function have been evaluated at: delta_x = x2 - x1.

delta_gradndarray

The difference between the gradients:delta_grad = grad(x2) - grad(x1).