MATLAB: How to interpolate at NaN values

forinterpolationnanvector

I have a vector [1 2 3 NaN 4 4.5 5.5 NaN NaN 6 6 7 NaN NaN NaN 8] and I want [1 2 3 3.5 4 4.5 5.5 5.75 5.75 6 6 7 7.5 7.5 7.5 8]. Is it possible to do this without a for cycle?

Best Answer

No loops, no third-party functions, and works for all MATLAB versions:
>> V = [1 2 3 NaN 4 4.5 5.5 NaN NaN 6 6 7 NaN NaN NaN 8];
>> X = ~isnan(V);
>> Y = cumsum(X-diff([1,X])/2);
>> Z = interp1(1:nnz(X),V(X),Y)
Z =      1.00    2.00    3.00    3.50    4.00    4.50    5.50    5.75    5.75    6.00    6.00    7.00    7.50    7.50    7.50    8.00
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