It may be more efficient (given the current implementation) to filter the I, J, and V arrays directly and then call sparse() again.
On Wednesday, January 7, 2015 12:48:31 PM UTC-7, Christoph Ortner wrote: > > > Thanks for your replies - I will write a short piece of code that shows > the performance problem, and then submit an issue. > Christoph > > P.S: I do use sparse(I,J,V) to construct the matrix, but I am then unable > to extract a sub matrix because the slicing is so slow. >
