What causes "spline" to give NaN for some elements?

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Aarti Dwivedi on 9 Jun 2015

Commented: Walter Roberson on 9 Jun 2015

My code is

elev=spline(tm,el,tt);

Neither tm nor el contain NaN elements. How can I resolve the issue of getting NaN in spline interpolation? What causes spline to return NaN?

Walter Roberson on 9 Jun 2015

is length(el) the same as length(tm) or is it 2 greater than length(tm) ?

Do the NaN occur at tt locations that are beyond the original range of tm?

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