On Wednesday, January 7, 2015 1:48:31 PM UTC-6, 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. >
Can you check which of the I,J pairs correspond to the desired slice and use only those indices for I,J and V?
