- If you specify the 'pchip' or 'spline' interpolation methods, then the default behavior is 'extrap'.
- All other interpolation methods return NaN by default for query points outside the domain.
interp1 using method 'previous' returns an unexpected NaN?
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Marc Cousoulis
il 12 Gen 2017
Modificato: Stephen23
il 12 Gen 2017
x = [1 2 4]; v = [17 100 17]; xq = 1:5; vq = interp1(x,v,xq,'previous');
vq = 17 100 100 17 NaN
Why is vq(5) not equal to 17?
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Stephen23
il 12 Gen 2017
Modificato: Stephen23
il 12 Gen 2017
Your query point is outside of the input domain (from 1 to 4), so NaN is the correct and documented output.
As the documentation states, if you want to extrapolate, then you need to specify this:
vq = interp1(x,v,xq,'previous','extrap')
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