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by hyperrail
1919 days ago
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One interesting wrinkle is that traditionally (dating back to FORTRAN IV at least), Fortran compilers store matrices in RAM address space using column-major order, where consecutive elements are in the same column, not the same row. [1] Most languages that prioritize Fortran code interop also adopt column-major order, but most other languages that support multidimensional arrays do row-major order. I'm not sure why Fortran went column-major but because it did, a lot of libraries designed for Fortran callers (such as LAPACK and all BLAS implementations) need to be told that input arrays have been transposed when they come from languages like C++. [1] https://en.wikipedia.org/wiki/Row-_and_column-major_order |
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