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Questions on optimizing Mathematica code for higher performance. This may mean faster execution, lower memory usage or both. Not to be confused with mathematical optimization.

2 votes
1 answer
75 views

Efficient ways to generate a matrix from multiplying two elements of some matrix

I am working on the single particle entanglement entropy and in the process I have something like Table[ Sum[ states[[eindex, spaceindex]] * states[[eindex, spaceindex2]], {eindex …
4 votes
1 answer
121 views

Building projection operators efficiently

The projection operator $P$ is defined in quantum mechanics as $$ P=\sum_i^n \vert\psi_i\rangle \langle \psi_i\vert, $$ where $\vert\psi_i\rangle$ is a column vector and $(\langle \psi_i\vert=(\ …