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GriddedInterpolant performance, meshgrid vs ndgrid formats

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Mark Brandon
Mark Brandon 2021-3-9
评论： Bruno Luong 2023-4-2
I have been using griddedInterpolant for a long time now. But, starting today, I got the following warning:
Warning: Query data is in MESHGRID format, NDGRID format will yield better performance.
Convert your query data (Xq, Yq) as follows:
F = griddedInterpolant(. . .);
Xq = Xq'; Yq = Yq';
Vq = F(Xq,Yq);
I searched but have not found any discussion about this performance issue. I am hoping that someone out there can help.
Note that I am fully aware of the difference between MESHGRID and NDGRID formats. I am curious about why the NDGRID format provides an advantage.
My guess is that it has to do with column vs row operations.
Best,
Mark
  2 个评论
Bruno Luong
Bruno Luong 2023-4-2
Oddly to me, this transposition
Xq = Xq'; Yq = Yq';
Vq = F(Xq,Yq)
could be done internaly by griddedInterpolant. Why throwing a warning instead of implementing the recommended fix?

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回答（1 个）

Matt J
Matt J 2021-3-10
Presumably because ndgridded query data will result in the data being looped through with better memory locality.

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