That would be --with-precision=single. However PETSc currently doesn't compile in this mode. Satish On Tue, 11 Apr 2006, abdul-rahman at tu-harburg.de wrote: > Dear all, > > if I were to compute in single precision complex, should I configure > > --with-precision=single or matsingle, or both? > > Thank you, > > Regards, > > Razi > >