[Help-gsl] heapsort algorithm in gsl

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Dear all,

I've written the heapsort algorithm as it's implemented in GSL
You can find it in attachment...
but I'm not able to get it working...I don't understand where I'm wrong and 
this is getting me crazy :-(
...It would be highly appreciated if anyone could help me

thanks in advance

--frank

vdouble_sort_index.c
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