Alternative to interp2

I am trying to interpolate values in a 2d space. But my code is very slow.

I used the tic toc and found that it is because of interp2 being called multiple times. Is there an alternate for it ? that would be faster ?

Answer 1

[Ayush Modi]

Hi,

"griddedInterpolant" function will run faster and is recommended by MathWorks as an alternative to calling "interp2" multiple times.

Refer to the following documentation for more information on "griddedInterpolant" function:

https://www.mathworks.com/help/matlab/ref/griddedinterpolant.html#bvh2f0p-2:~:text=Grid%20Vectors-,Tips,-It%20is%20quicker

[Magnate]

Thanks Ayush, griddedInterpolant got the run time to the acceptable range.

Answer 2

[John D'Errico]

Perhaps you are calling interp2 multiple times in a loop, when a single call with multiple points will be far faster. This would be true also with griddedInterpolant. Both tools will be internally optimized to perform much better in a vectorized way.

[Magnate]

It is not inside a loop. but I will read about vectorized way. thanks.