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complex numbers in libguile


The gsl contains many functions that involve complex numbers. While they
are a custom datatype in C libraries, they're a built-in type in scheme.
How does one pass real- and imgainary part of a SCM obj representing a
complex number through libguile, so that the gsl can map it from and to
an instance of the corresponding struct ? I don't feel like constructing 
a smob for something that already has a built-in equivalent.

   Klaus Schilling