[ncl-talk] Sorting an array depending on first column

[Dennis Shea]

Actually, the following is more 'elegant'

Ain = (/ (/2,1,3/), (/6,2,4/), (/3,1,5/), (/1,7,4/) /)

 i    = dim_pqsort_n(Ain(:,0), 1, 0)
 Aout = Ain(i,:)

On Tue, Dec 6, 2016 at 6:20 AM, Dennis Shea <shea at ucar.edu> wrote:

> Similar to Karin's but use 'dim_pqsort_n'
>   http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_pqsort_n.shtml
>
>
>  Ain = (/ (/2,1,3/), (/6,2,4/), (/3,1,5/), (/1,7,4/) /)
>
>  i   = dim_pqsort_n(Ain(:,0), 1, 0)
>  print(i)
>
>  dimA = dimsizes(Ain)
>  nrow = dimA(0)
>
>  Aout = Ain
>  do nr= 0,nrow-1
>     Aout(nr,:) = Ain(i(nr),:)
>  end do
>
>
>
> On Tue, Dec 6, 2016 at 3:30 AM, Karin Meier-Fleischer <
> meier-fleischer at dkrz.de> wrote:
>
>> Hi Abhik,
>>
>> you can use NCLs function *dim_pqsort *to sort the array by the first
>> column.
>>
>> begin
>>   Ain  = (/ (/2,1,3/), (/6,2,4/), (/3,1,5/), (/1,7,4/) /)
>>
>> ;-- criteria is to sort the array Ain by increasing of the first column
>>   cols_0 =  Ain(:,0)                        ;-- get first columns of
>> each row
>>   i0     =  dim_pqsort(cols_0,2)            ;-- sorting by increasing
>> and overwrite cols_0 return sorted indices i0
>>
>> ;-- resort Ain
>>   Aout   =  Ain(i0,:)                       ;-- use sorted indices of
>> first column to sort the complete array
>>
>> ;-- print the new array in a nicer way
>>   opt       =  True
>>   opt at title = "Sort array by first column of each row"
>>   write_matrix(Aout,"3I4",opt)
>>
>> end
>>
>> This will print Aout
>>
>>  Sort array by first column of each row
>>
>>    1   7   4
>>    2   1   3
>>    3   1   5
>>    6   2   4
>>
>> Bye,
>> Karin
>>
>> Am 06.12.16 um 06:59 schrieb Abhik Santra:
>>
>> Hi NCL users
>>
>> How can I sort an array based on its first column elements?
>> For example, if
>>
>> Ain = (/ (/2,1,3/), (/6,2,4/), (/3,1,5/), (/1,7,4/) /)
>>
>> then how can I get
>>
>> Aout = (/ (/1,7,4/), (/2,1,3/), (/3,1,5/), (/6,2,4/) /) ?
>>
>> Any help would be greatly appreciated.
>>
>> Thanks,
>> Abhik
>>
>> ****************************************
>> Abhik Santra
>> Postdoctoral Research Fellow
>> Australian Bureau of Meteorology,
>> Melbourne, Australia
>> ****************************************
>>
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