[ncl-talk] Regarding to the example 5 of the WRAPIT page

[Dennis Shea]

The following statement is incorrect.

===
But both NCL and FORTRAN have the array convention of
(number of rows, number of columns)
===

fortran is column major
NCL (think C) is row major.

====
NCL/Fortramn argument passing

[1]
Arrays need no reordering. The 'rule' is: fastest varying dimension in  on
language maps into the fastest varying dimension in the otherv language. In
NCL, the rightmost dimension is the fastest varying dimension. In Fortran,
the leftmost dimension is the fastest varying.

               NCL                                  Fortran
        x(time,lev,lat,lon)  <=map=>  x(lon,lat,lev,time)
[2] Think of an array as being a long 1D list in memory

     NCL: x(N,M)       Fortran(M,N)  where M=3, N=2

                     memory
x(0,0)     =>    7.23     <=     x(1,1)
x(0,1)     =>   -12.5     <=     x(2,1)
x(0,2)     =>      0.3      <=     x(3,1)

x(1,0)     =>   323.1    <=     x(1,2)
x(1,1)     =>  -234.6    <=     x(2,2)
x(1,2)    =>    200.1    <=     x(3,2)


On Thu, Aug 18, 2016 at 1:49 AM, Ng, Kelvin Sai-cheong <kscng at connect.hku.hk
> wrote:

> Hi,
>
> I am just wondering why does the dimension of the input array in NCL (i.e.
> fxy) has dimension of (n,m), whereas the array in the FORTRAN function
> (i.e. FXY) has dimension of (m,n)?
>
> But both NCL and FORTRAN have the array convention of
> (number of rows, number of columns).
>
> Link: http://www.ncl.ucar.edu/Document/Tools/WRAPIT.shtml#Example_5
>
> Many thanks,
>
> Kelvin
>
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