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GriddedInterpolant performance, meshgrid vs ndgrid formats

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Mark Brandon
Mark Brandon on 9 Mar 2021
Answered: Matt J on 10 Mar 2021
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

Answers (1)

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

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