Re: [Discuss-gnuradio] which math library to link with

[Marcus Müller]

Martin Braun wrote:
> [1] But perhaps they're reading this and would like to comment.
Yes, we do!
The problem with the gsl is that it provides methods for real
symmetric and nonsymmetric eigenvalue problems, but only for complex
hermitian, and we needed to decompose nonsymmetric complex matrices.
But afaIk it has singular value decomposition methods
of the like gsl_linalg_SV_decomp*, I've just never worked with those.
Amardillo is a library with a very nice and intuitive (read: comparably
easy to use as matlab when handling matrizes) API, providing SVDs
(which I did not test either), which, sadly has not have a very long 
history yet, and did go through some API changes in the recent past.
When using Fortran, we did not actually add a lot of library (aside from 
LAPACK) dependencies, but the need for a decent fortran compiler,
and a whole lot of makefile magic. Calling fortran functions from C++/GR 
works nicely, if you realize you really have to take care you pass the 
right arguments.

Conclusion: Try the GSL, it's SVD methods should work quite fine.
If you don't like gsl, try armadillo. If you're fine with fortran
and LAPACK: Do it. Write a C header file for your Fortran functions
and call them. Build a fortran shared library and link it to your c++
library. Do math. Really fast.

Happy Hacking

Marcus Müller



On Dec 1, 2011, at 4:56 PM, Achilleas Anastasopoulos <address@hidden> 
wrote:

> > > We are writing a block that requires SVD of matrices.
> > > Is there a preferred library (eg, LAPACK) that other gnuradio blocks
> > > are already using that we can link with.
> > > I don't want to add another library dependence...