Re: [ojAlgo-user] Sparse matrices multiplication

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

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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