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Re: Double-precision floating point arithmetics behaves differently in G
Re: Double-precision floating point arithmetics behaves differently in Guile and in C
Sat, 16 Oct 2021 09:19:20 +0000
Panicz Maciej Godek schreef op ma 27-09-2021 om 16:04 [+0200]:
> niedz., 26 wrz 2021 o 21:11 Matt Wette <email@example.com>
> > 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?
> I mean, I have used exactly the same algorithm (obtained by
> 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,
might be relevant.
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