For questions about the functionality related to permutations in Mathematica.

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2answers
58 views

Permuting symbols

Suppose I have a list like {a, b, a, c}. How can I apply a "symbolic permutation" of the symbols a, ...
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0answers
41 views

Differences in AbsoluteTiming for similar codes

Consider the two following codes with the same SeedRandom (which ensures the same set of random numbers) but different use of the ...
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0answers
29 views

Fast arithmetic on matrix elements

I have a square matrix $U$ of dimension $L\times L$, I am interested in the following quantity $U_{1,j}U_{2,k}U_{3,l}U_{4,m}\cdots U_{L,q}$ summed over all permutations of the letter indices, ...
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0answers
238 views

Efficient submatrix swaps for large sparse matrix

I am implementing the 'swap' algorithm for a binary matrix to generate matrix permutations that maintain row and column totals. My problem is that my matrices are large and sparse (e.g., 19774 x 942, ...
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0answers
153 views

Constructing and Reducing Tuples in a Memory Efficient Manner

This question is extension of a question I started here: Reduce the output from tuples by including symmetry? and will focus on higher order arrays and issues of optimization (similar to what I've ...