[ncl-talk] sparse_matrix_mult

[Mary Haley]

Hi Mark,

I wanted to get back to you on this sooner.  This is definitely puzzling. I
will take a closer look at the function to see if the documentation or the
calculation is wrong.

Thanks for bringing this up.  I will put a high priority on this (NCL-2708).

--Mary


On Mon, Dec 18, 2017 at 2:50 PM, mark collier via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi,
>
> I've been testing out some features/applications of sparse_matrix_mult and
> curious why the example doesn't replicate documentation, it could be that
> the documentation is out of date.
>
>
>
> If I run example 1 from https://www.ncl.ucar.edu/
> Document/Functions/Built-in/sparse_matrix_mult.shtml
>
>
> I get:
>
>
>
>      bash-4.1$ ncl test_sparse.ncl
>  Copyright (C) 1995-2017 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.4.0
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
>
>    3.   6.   9.
>   16.  20.  24.
>   91. 104. 117.
> ***************
>
>
> Variable: y
> Type: float
> Total Size: 48 bytes
>             12 values
> Number of Dimensions: 2
> Dimensions and sizes:   [4] x [3]
> Coordinates:
> Number Of Attributes: 1
>   _FillValue :  9.96921e+36
> (0,0)    3
> (0,1)    6
> (0,2)    9
> (1,0)   16
> (1,1)   20
> (1,2)   24
> (2,0)   91
> (2,1)   104
> (2,2)   117
> (3,0)   9.96921e+36
> (3,1)   9.96921e+36
> (3,2)   9.96921e+36
> bash-4.1$ ncl -V
> 6.4.0
> bash-4.1$ uname -a
> Linux raijin1 3.10.0-693.5.2.el6.x86_64 #1 SMP Tue Oct 24 10:37:43 AEDT
> 2017 x86_64 x86_64 x86_64 GNU/Linux​
>
> I have been using this function in relation to ESMF regridding, the
> regridding seems to be working using this call but I am porting the weights
> application to a python based approach and need to understand exactly what
> the matrix multiplication is doing.
>
> Thanks for any advice
> Mark.
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