Multidimensional interpolation with integer input

Posted by Steve Eddins, June 29, 2006

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A customer asked me last week how to do multidimensional interpolation with integer inputs. The MATLAB function interpn supports only double- and single-precision inputs.

It's possible to do this using a little-known Image Processing Toolbox function called tformarray. But tformarray is a general spatial transformation engine with a complicated syntax. It isn't easy to figure out how to use it for interpolation, so I decided to write a wrapper M-file to do it.

The function iminterpn, which has a syntax similar to interpn, is now available on the MATLAB Central File Exchange. I hope some of you find it useful.