Is there any support for sparse matrices in core.matrix or Neanderthal

I think core.matrix has sparse matrix support ….

@michaellindon here is an example from when I was playing around with hypervectors https://github.com/gigasquid/hyperdimensional-playground/blob/master/src/hyperdimensional_playground/core.clj

@gigasquid I think you are right, I now see sparse-matrix in the documentation. This allows one to represent a sparse matrix, I wonder if mmul sparsematrix sparsevector will work as I expect. I think it depends on what implementation is being used for core.matrix. I guess an implementation is needed that supports linear algebra operations on sparse matrices

I fear it might just convert to a dense matrix and use dense linear algebra operations

I've always been using vectorz implementation

Googling shows vectors has some sparse support

I'll do some timings and see what happens :)

Thanks for your help

It is kind of hit or miss. Some operators work, but others (outer product for example) went totally off the rails (taking a couple sparse matrices and trying to move to dense => KABOOM)