On 05/28/2016 03:33 PM, Kouhei Kaigai wrote:
>> -----Original Message-----
>> From: Joe Conway [mailto:m...@joeconway.com]
>> Sent: Sunday, May 29, 2016 1:40 AM
>> To: Kaigai Kouhei(海外 浩平); Jim Nasby; Ants Aasma; Simon Riggs
>> Cc: pgsql-hackers@postgresql.org
>> Subject: Re: [HACKERS] Does people favor to have matrix data type?
>> On 05/28/2016 07:12 AM, Kouhei Kaigai wrote:
>>> Sparse matrix! It is a disadvantaged area for the current array format.
>>> I have two ideas. HPC folks often split a large matrix into multiple
>>> grid. A grid is typically up to 1024x1024 matrix, for example.
>>> If a grid is consists of all zero elements, it is obvious we don't need
>>> to have individual elements on the grid.
>>> One other idea is compression. If most of matrix is zero, it is an ideal
>>> data for compression, and it is easy to reconstruct only when calculation.
>>>> Related to this, Tom has mentioned in the past that perhaps we should
>>>> support abstract use of the [] construct. Currently point finds a way to
>>>> make use of [], but I think that's actually coded into the grammar.
>>> Yep, if we consider 2D-array is matrix, no special enhancement is needed
>>> to use []. However, I'm inclined to have own data structure for matrix
>>> to present the sparse matrix.
>> +1 I'm sure this would be useful for PL/R as well.
>> Joe
> It is pretty good idea to combine PL/R and PL/CUDA (what I'm now working)
> for advanced analytics. We will be able to off-load heavy computing portion
> to GPU, then also utilize various R functions inside database.

Agreed. Perhaps at some point we should discuss closer integration of
some sort, or at least a sample use case.

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