[petsc-users] smallest SVD values in Slepc doesn't work for matrices larger than ~200

[David Liu]

Hi, I'm having trouble using the SVD solver to find the smallest singular
values. As a simple example:

http://www.grycap.upv.es/slepc/handson/handson4.html

When I run the command in the example: (./ex14 -file
$SLEPC_DIR/share/slepc/datafiles/matrices/rdb200.petsc), it converges
exactly as the page says it would, in 3 iterations. However, if I want the
smallest values, I add the option

"-svd_smallest"

to the end of that command, and this time it doesn't converge at all. Is
there some additional option I need to add, for example, something to do
with the SVD object's EPS or ST, to make this work?

best,
David
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