[ncl-talk] get index for A associated with B

[Alan Brammer]

Take look at get1Dindex linked below.  It should do what you want. Below
are a few quick example lines I threw together to get the matching indices
for both A and B.

https://www.ncl.ucar.edu/Document/Functions/Contributed/get1Dindex.shtml



e.g.

A = (/1990,1997,1999,2002,2005,2010/)

B = (/1993,1997,2002,2004/)


A_ind = get1Dindex(A,B)        ;; array size B of where A is in B, Fill if
not in B
A_ind_nm = A_ind(ind(.not.ismissing(A_ind))) ;; get rid of missing elements
Ca = A(A_ind_nm)                 ;; probably want an error check in case
there are no overlaps.


B_ind = get1Dindex(B,A)        ;; array size B of where A is in B, Fill if
not in B
B_ind_nm = B_ind(ind(.not.ismissing(B_ind))) ;; get rid of missing elements
Cb = B(B_ind_nm)                 ;; probably want an error check in case
there are no overlaps.


Gd Luck.

Alan.


On 10 June 2015 at 15:33, Xi Chang <xi.chang01 at gmail.com> wrote:

> Hallo all,
>
> Anyone can give me a hint how to get list of index for A which is
> associated with B,
> for illustration:
>
> file A containts :
> -1990
> -1997
> -1999
> -2002
>
> file B
> -1993
> -1997
> -2002
> -2005
>
> and in the end, will produce file C which only containts:
> -1997
> -2002
>
> I cant do it mannually becaise the time series are too long..
> any suggestion for a  clean alogirhtm?
>
> Thanks
> Chang
>
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