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2011-05-18 10:20:46 -0600 | asked a question | Matrix/Tensor derivative for Stress Tensor I need to do define/calculate the following stress tensor in an elegant way: $T_{i,j} := -p \delta_{i,j} + \eta (\partial_i v_j + \partial_j v_i)$ where i,j can be x,y,z and $\partial_i v_j := \frac{\partial v_j}{\partial i}$ I've found the sage-function kronecker_delta for the first term, but I am having problems with the two partial derivatives. Thanks in advance! |

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