linear algebra package question

[adler at stephenadler.com (Stephen Adler)]

Aren't the xDOT routines a vector dot product who's result is
a scaler value? As in

  for (int i=0;i<VectSize;i++) a += b[i]*c[i];

?

Steve.

On Tue, 2004-07-13 at 15:43, Ed Hill wrote:
> On Tue, 2004-07-13 at 15:27, Stephen Adler wrote:
> > Guys,
> > 
> > I'm thinking of using the gsl-blas routines provided by
> > gsl to do some basic linear algebra stuff. Now, I want to
> > do something really simple, do a scaler multiply of 2 vectors,
> > (i.e.
> > 
> >    for (int i=0;i<VecSize;i++) c[i] = a[i]*b[i]
> > 
> > )
> 
> 
> Hi Stephen,
> 
> Thats a standard BLAS xDOT() function where "x" depends on the type of
> your arrays (most likely you're using "DDOT" for doubles or "SDOT" for
> single precision reals).
> 
> On most Linux systems, you can easily install a "blas" package and then
> view the documentation for it using something like the following:
> 
>   ggv /usr/share/doc/blas-3.0/blasqr.ps
> 
> which works nicely on Fedora Core 2.  The BLAS libs are often highly
> optimized for particular chips and theres plenty of documentation for
> them on the web.
> 
> Ed