Re: [ojAlgo-user] Sparse matrices multiplication

[Anders P. <an...@op...>]

FYI

https://github.com/optimatika/ojAlgo/wiki/Sparse-Matrices

ojAlgo's sparse capabilities have been greatly improved with some recent updates.


> On 29 May 2016, at 23:13, Anders Peterson <an...@op...> wrote:
> 
> I just checked in some changes that may interest you:
> 
> 
> 1) The multiply-method in MatrixStore
> 
> PhysicalStore<N> multiply(Access1D<N>, PhysicalStore<N>)
> 
> has changed to
> 
> void multiply(Access1D<N>, ElementsConsumer<N>)
> 
> 
> 2) SparseStore now implements ElementsConsumer
> 
> 
> Those two changes in combination essentially makes it possible to do what you asked:
> 
> a.fillByMultiplying(Cf.transpose(), Yf));
> 
> or
> 
> Cf.transpose().multiply(Yf, a);
> 
> 
> 
> I have not implemented any new multiplication algorithm, but the existing ones already to some extent exploit sparsity/structures. 
> 
> 
> 
>> On 22 maj 2016, at 17:04, Anders Peterson <an...@op...> wrote:
>> 
>> ojAlgo does not support that (yet).
>> 
>> 
>>> On 21 maj 2016, at 16:31, Santiago Peñate Vera <san...@gm...> wrote:
>>> 
>>> Hi,
>>> 
>>> I am starting with OjAlgo and I find that the multiplication of 2 sparse 
>>> matrices returns a full matrix (or so says netbeans)
>>> 
>>> Here Cf and Yf are sparse matrices and I need their multiplication:
>>> 
>>> SparseStore a = Cf.transpose().multiply(Yf);
>>> 
>>> How do I do a sparse multiplication with OjAlgo?
>>> 
>>> Thanks
>>> 
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>