# Tag Info

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### FEM for vector valued problems: reference request

Short answer: Just replicate the vector of interpolation functions into a block-diagonal matrix, as showed e.g. on page 5 in this lecture note. Detailed answer: Mathematically oriented texts typically ...
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### Direct Numerical Simulation of reacting flows

Like WolfgangBangerth, I strongly recommend that you reconsider your motivation (or your supervisor's motivation) for this goal. First, look at Center for Exascale Simulation of Combustion in ...
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• 350
1 vote
Accepted

### Vector and index notation equivalence

Is it possible to tell in index notation whether a vector is a row or column vector, or is that supposed to be clear based on context? It seems the answer is actually lurking in your question itself ...
1 vote
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### Sparse matrix vector product using PETSC

I assume that you are comparing multiplication with an assembled PETSc matrix with your hand-coded matrix-free method. The latter may indeed be faster, but this could be because no entries of ...

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