Re: [Help-gsl] Extracting real/imag parts of complex vectors and matrices

[James Bergstra]

Vectors and matrices are two different structures...

You can get the real or imaginary part of a complex vector by playing
with the data and stride members:

gsl_vector_complex * c;
gsl_vector r;
gsl_vector i;

r.data = c.data;
r.stride = c.stride * 2;
i.data = c.data + 1;
i.stride = c.stride * 2;

i.size = r.size = c.size;

The matrix is a bit tougher, because the matrix structure depends on one
of the dimensions being stored contiguously in memory.  A complex matrix
interleaves the real and complex components, so you'll have to copy the
real/imaginary parts out into a normal gsl_matrix.

James

On Fri, Jul 08, 2005 at 01:04:51PM -0500, Tyler Brown wrote:
> Hi,
> 
> Does anyone know if there is a gsl function that returns the real (or 
> imaginary) part of complex vectors and matrices?  Of course a macro can be 
> used for a scalar and a function can be written but I would think someone 
> would have done this.
> 
> Thanks in advance,
> 
> Tyler
> 
> Tyler Brown, Senior Engineer
> Research and Development
> Zenith Electronics
> Tel: (847) 941-8797
> Fax: (847) 941-8555
>  
> _______________________________________________
> Help-gsl mailing list
> address@hidden
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-- 
james bergstra
http://www-etud.iro.umontreal.ca/~bergstrj