duration.isnan
duration: TF = isnan (D)
Return true for duration elements that are Not-A-Number.
TF = isnan (D) returns a logical array TF of
the same size as D containing true for each corresponding
element of calD that is NaN and false otherwise.
Source Code: duration
isnan flags the elements whose value is Not-a-Number.
d = hours ([1, NaN, 3])
d =
1x3 duration array
1 hr NaN hr 3 hr
isnan (d)
ans = 0 1 0