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Re: [ferret_users] how to select nonsequential time steps



Hi,
The SAMPLE functions do this:

yes? show function sampleL
SAMPLEL(TO_BE_SAMPLED,T_INDICES)
    sample a field at a list of T indices
    TO_BE_SAMPLED: data to sample at list of T indices supplied
    T_INDICES: list of T indices at which to sample

! Check how the grid is defined for the result. The grid in the other directions will be passed to the result:

yes? sh func/details samplel
SAMPLEL(TO_BE_SAMPLED,T_INDICES)
    sample a field at a list of T indices
        Axes of result:
          X: inherited from argument(s)
          Y: inherited from argument(s)
          Z: inherited from argument(s)
          T: ABSTRACT (result will occupy indices 1...N)
          E: inherited from argument(s)
          F: inherited from argument(s)
    TO_BE_SAMPLED: data to sample at list of T indices supplied (FLOAT)
        Influence on output axes:
          X: passed to result grid
          Y: passed to result grid
          Z: passed to result grid
          T: no influence (indicate argument limits with "[]")
          E: passed to result grid
          F: passed to result grid
    T_INDICES: list of T indices at which to sample (FLOAT)
        Influence on output axes:
          X: no influence (indicate argument limits with "[]")
          Y: no influence (indicate argument limits with "[]")
          Z: no influence (indicate argument limits with "[]")
          T: no influence (indicate argument limits with "[]")
          E: no influence (indicate argument limits with "[]")
          F: no influence (indicate argument limits with "[]")

-Ansley


On 8/26/2014 3:58 AM, Hussen Seid wrote:
Dear ferreters,

I want to select the variable at different(non-sequential) time steps using a "let" command (say at l=2, l=5, l=9, l=11, l=15, 18,  l=20). Is it possible to do this in ferret?

!Example
use sst_test.nc
sh d
     currently SET data sets:
    1> ./sst_test.nc  (default)
 name     title                                                    I          J         K         L         M         N
 SST      Monthly Mean of Sea Surface Tem  1:360     1:180     ...       1:27      ...       ...

let sst_new=sst[l=2, 5, 9, 11, 15, 18, 20] ! I tried it in this way, but doesn't work

Thanks in advance
Hussen

--
Hussen Seid Endris
PhD Student
Climate System Analysis Group
Department of Environmental and Geographical Science
University of Cape Town
Private Bag Rondebosch, 7701, Cape Town, South Africa
Tel:(+27) (0)74 222 4357


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