Panicz Maciej Godek schreef op ma 27-09-2021 om 16:04 [+0200]: > niedz., 26 wrz 2021 o 21:11 Matt Wette <matt.we...@gmail.com> > napisał(a): > > > Your post is a little vague. Are you comparing singular values > > vectors > > of A vs > > eigenvalues, eigenvectors of A'*A ? Also, SVD is iterative and > > different algorithms may yield > > different results (and some of the SVD algorithms out there are not > > great). > > Are you using the exact same algorithm but noticing that (op x y) > > in > > Guile > > behaves differently than (x op y) in C? > > > > > Yes. > I mean, I have used exactly the same algorithm (obtained by > mechanically > transforming the scmutils code into C), and I've been looking at its > operation, and noticed that the results of floating point operations > differed between Guile and C for the same input data.
If this is on x86, https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fexcess-precision might be relevant. Greetings, Maxime.
