Thank you ! This information certainly helps to call the Fortran properly.
Fortunately for optimization problems, there exists such a nice routine that
does not need a callback ! For quadratures, unfortunately, I do not know any
of such type, all of the most useful ones I know require callbacks. :-(
Anyway I'll try to study the existing callback interface more closely. May be
with some hacking I could get what I want from it.
With the best regards,
Konstantin.
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