[ncl-talk] get first index of each sequence

[Xi Chang]

Hi NCL community,

Is there anyone who can help me on how to return the first index of each
sequence in 1D data?
For example,

x = (/-999,-999,-999,-999,1,1,1,1,1,-999,-999,-999,1,1,1,-999,1,1,1/)
x at _FillValue=-999

There are 3 sequences of data in that 1D time series, how could I get the
first index of each sequence, so that the answer would be:

(0) 4
(1) 12
(2) 16

Thanks
Chang
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