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COMP-FORTRAN-90  February 2012

COMP-FORTRAN-90 February 2012

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Subject:

Re: Sorting large array

From:

Aleksandar Donev <[log in to unmask]>

Reply-To:

Fortran 90 List <[log in to unmask]>

Date:

Wed, 8 Feb 2012 11:05:07 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (37 lines)

On 02/08/12 11:01, John Reid wrote:
> Heapsort is brilliant and there is a Fortran code in Numerical Recipes.
Great, thanks for the advice. I dug out that the GNU Scientific Library 
uses heapsort, so all I needed was to do:

    interface GSLSort ! GNU Scientific Library heapsort
       !void gsl_sort (double * data, size_t stride, size_t n)
       subroutine gsl_sort(data, stride, size) bind(c)
          use iso_c_binding
          integer(c_size_t), value :: stride, size
          real(c_double), intent(inout) :: data(size)
       end subroutine
       subroutine gsl_sort_float(data, stride, size) bind(c)
          ! Uses heapsort
          use iso_c_binding
          integer(c_size_t), value :: stride, size
          real(c_float), intent(inout) :: data(size)
       end subroutine
    end interface

and then link in the library that is already on my system. Now it is 
working with reduced memory usage.

I also found out someone is working on a Fortran interface (FGSL) to 
GSL, though for this simple use I did not need the whole library.

Best,
Aleks

-- 
Aleksandar Donev, Assistant Professor of Mathematics
Courant Institute of Mathematical Sciences
Office: 1016 Warren Weaver Hall, New York University
E-mail: [log in to unmask]
Phone: (212) 992-7315; Fax: (212) 995-4121
Mailing address: 251 Mercer St, New York, NY 10012
Web: http://cims.nyu.edu/~donev

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