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in reply to How does Math::GSL accept data?

http://cpansearch.perl.org/src/LETO/Math-GSL-0.18/t/Histogram.t
$stream = gsl_fopen("histogram", 'r'); my $h = gsl_histogram_alloc(100); ok_status(gsl_histogram_fread($stream, $h));
so
my $fi = gsl_fopen( 'infile','r');