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

[Alan Brammer]

I'm not sure which version of ncl you're using but those 3 lines work for
me in 6.2.x and 6.3.0.
The documentation for get1Dindex explicitly states that repeated values are
allowed and the first occurrence is returned.
That error usually means that A_ind already exists and has a different size
to the return value.
To be sure you can use the := operator to redefine the variable.


ncl



ncl 0>  A = (/1990,1997,1999,2002,2002,2005,2010,2010/)

ncl 1> B = (/1993,1997,2002,2004/)

ncl 2>

ncl 3> A_ind = get1Dindex(A,B)

ncl 4> print(A_ind)



Variable: A_ind

Type: integer

Total Size: 16 bytes

            4 values

Number of Dimensions: 1

Dimensions and sizes: [4]

Coordinates:

Number Of Attributes: 3

  _FillValue : -2147483647

  index_info : Out of nWant=4 : multiple index occurrences=1

  nMultInd : 1

(0) -2147483647

(1) 1

(2) 3

(3) -2147483647

ncl 5>



On 10 June 2015 at 16:30, Xi Chang <xi.chang01 at gmail.com> wrote:

> HI Alan,
>
> Thanks, and I knew that. The problem is that I have  file A containts
> repeatation years that make this function does not work properly, an
> example:
>
> ncl 7> A = (/1990,1997,1999,2002,2002,2005,2010,2010/)
>
> ncl 8> B = (/1993,1997,2002,2004/)
>
> ncl 9>
>
> ncl 10> A_ind = get1Dindex(A,B)
>
> fatal:Dimension sizes on right hand side of assignment do not match
> dimension sizes of left hand side
>
> fatal:Execute: Error occurred at or near line 1242 in file
> $NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl
>
>
> fatal:Execute: Error occurred at or near line 10
>
> It seeems like this function does not allow repeatation of the year. any
> suggestion?>
>
> Chang
>
>
>
>
>
> On Wed, Jun 10, 2015 at 10:18 PM, Alan Brammer <abrammer at albany.edu>
> wrote:
>
>> 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
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
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>>>
>>>
>>
>
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