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rust-ndarray / ndarray

ndarray: an N-dimensional array with array views, multidimensional slicing, and efficient operations

Home Page:https://docs.rs/ndarray/

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Code runs faster with `DMatrix` than with `SMatrix`

sourproton opened this issue · comments

commented

Hi. Along with @thibautflottat, I was experimenting converting a code that solves mean field equations from python to rust, using nalgebra. Here's the source. The "translation" was a success and the code runs much faster. Great job with nalgebra!

We have a couple 50x50 matrices upon which we do multiplications, eigenvalues and other kind of calculations to fill a 500x500 Vec<Vec<>>.

We found out that on our machine the code that uses DMatrix is slower than the equivalent SMatrix version, with the same matrix dimensions. The DMatrix code is the main branch, and the SMatrix version is the static branch of the repo.

Is this expected behavior? Intuitively, we were expecting the static version to be less flexible (removing the option for the user to choose the variables of the problem, hard-coding them into consts) but faster.

commented

sorry wrong repo