8000 [DOC] Add doc for memory views with custom numpy dtype by NicolasHug · Pull Request #2813 · cython/cython · GitHub
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[DOC] Add doc for memory views with custom numpy dtype #2813

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Merged
merged 3 commits into from
Dec 6, 2021
Merged

[DOC] Add doc for memory views with custom numpy dtype #2813

merged 3 commits into from
Dec 6, 2021

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NicolasHug
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Closes #2760

I have added a section in the memory view doc that indicates how to use memory views on numpy array that have a custom dtype.

I really think this is something that should be in the docs somewhere. I needed this and the only source was one of the scipy paper from 2008.

@scoder
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scoder commented Feb 1, 2019

Thanks. May I ask where you found this? I'd like to be sure that that's still the right way to do it these days (could well be).

@NicolasHug
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S Behnel, R Bradshaw, D Seljebotn, Cython tutorial in Proceedings of the 8th Python in Science conference (SciPy 2009) page 9

"Cython structs are also allowed and corresponds to NumPy record arrays..."

@NicolasHug
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Friendly ping ;)

Do you need me to update anything?

@da-woods
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Can I ping this too? I think this is still the right way to do it, it is covered in the tests (

cython/tests/memoryview/numpy_memoryview.pyx

Line 455 in 75da5a9

def test_memslice_structarray(data, dtype):
) and it's currently a bit of an omission from the docs.

@scoder scoder added this to the 3.0 milestone Dec 6, 2021
@scoder scoder merged commit 369b41c into cython:master Dec 6, 2021
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scoder commented Dec 6, 2021

Thanks

@NicolasHug NicolasHug mentioned this pull request Mar 29, 2023
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cdef-ing a memory view or array with a custom numpy dtype
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@NicolasHug @scoder @da-woods
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