Why would I be getting "NaN" from a matrix I entered?

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Jack B on 24 Oct 2014

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Commented: Sean de Wolski on 28 Oct 2014

Hey all,

I seem to be getting a "NaN" from a matrix I entered as a variable while using the function griddata. Is there any obvious reason for this? Possibly difficulty interpolating a value?

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Patrik Ek on 24 Oct 2014

Edited: Patrik Ek on 24 Oct 2014

You have nan in your matrix? Your matrix was created with nan. Your input data is wrong? You are a victim of a practical joke involving team mates and corruption of data? Your computer decided that it wanted a retirement?...

Sorry, but no one is all knowing. The does most likely come from a bug in the implementation. Then we need to know where it went wrong. There is many ways to get nan, so the problem is what you did to get nan.

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Answer 1

Star Strider on 24 Oct 2014

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We need to see your code. My guess is that you’re asking it to extrapolate.

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Star Strider on 28 Oct 2014

My pleasure!

The griddata function won’t allow you to extrapolate, but interpn and some of its friends will. (The interpolation-extrapolation functions have different capabilities.) You may have to experiment to find a function that does what you want. Fortunately, they seem to share the same general argument list syntax.

There are several helpful links to other functions at the end of the griddata and other documentation pages that can help guide your search.