ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Thu, 21 Nov 2013 01:25:00 -0600Matrix/Tensor derivative for Stress Tensorhttp://ask.sagemath.org/question/8119/matrixtensor-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!packomanWed, 18 May 2011 10:20:46 -0500http://ask.sagemath.org/question/8119/Matrix equations and derivativeshttp://ask.sagemath.org/question/10759/matrix-equations-and-derivatives/Hello!
I am completely new to Sage and Python.
In order to get knowledge about Sage I'd like to find a way to express an equations like these
http://stats.stackexchange.com/questions/14827/how-to-calculate-derivative-of-the-contractive-auto-encoder-regularization-term
User with nickname fabee had posted derivatives of contractive autoencoder regularizer, and I want to reproduce these results in Sage. It's a big challenge for Sage newbies like me.
A few first attempts do not succeed so can you show me the way to do this task?
newbieThu, 21 Nov 2013 01:25:00 -0600http://ask.sagemath.org/question/10759/