how can i perform the calculation of the span at smoothing?

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I have some doubts on how to select the span in order to smooth all my NaN values and values.
For example, I got:
A = [5;7;9;19;NaN;NaN;NaN;NaN;5;NaN;7;NaN]
idx = [1:size(A,1)]'
B = smooth(idx,A,4,'loess')
If I use the span of 2, 3 or 4 I have the value "0" in some NaN's, if I use the span of 5, I got everything smoothed right.
I would like to know if it is possible, before doing the smooth code line, how to perform a calculation of span to ensure that the result doesn't have nan's?
Thanks for your time.
Tiago Dias
Tiago Dias on 10 Dec 2019
I assume it is because in my index 6 the span (i think is the window he considers) i got more nans than numbers.
I would recomend to go to a moving window strategy, has matlab centers the index ( lets say index 5) and he goes 4 above and 4 below, if span is 4.
here some example

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