[ncl-talk] missing value and index

[Xi Chang]

Dear NCL,

How can I change the values which are not associated with list of index to
be missing values, for instance let's say I have set of data in array A,
and list of index in array B,
then I need to get array C where, the values of A which are not associated
with indices in B, will be missing values?

A=(/1,12,3,14,5,26,7,18,9,10/) ;data
B=(/1,3,5/) ;index

then, the result will be:

C=(/-999, 12, -999, 14,-999,26, -999, -999, -999, -999/)

Thank you.
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