Extend DiffusionGrid interface for full gradient information #257
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This PR makes the
DiffusionGrid::GetGradientmore flexible. It allows retrieving the absolute value of the gradient such that modelers can use the full information of the gradient, e.g. define behaviors that are only executed if the gradient is stronger than a certain threshold.Furthermore, the PR introduces a UnitTest to verify that the gradients are computed correctly by comparing an analytic and numeric solution.