Questions tagged [linear-algebra]

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Coordinate Descent Non-negative Least Squares optimization

In my fast implementation of Non-negative Matrix Factorization (Rcpp Machine Learning Library, RcppML), about 40% of the runtime is spent solving Non-negative Least Squares (NNLS) systems (the rest of ...
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Why is this tensor contraction so slow and how can I make it faster?

I am trying to calculate a specific complicated tensor contraction (of complex valued tensors) which appears as part of some other calculation and is called multiple times in a row, about 100 times or ...
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Solving a linear system with Gaussian Elimination

I decided to implement a solver for linear systems of equations based on the gaussian elimination and reduction to upper triangular form. The gaussian elimination is quite simple to implement but the ...
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