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1 | ! $Header: /opt/cvsroot/jmfft/lib/jmfftfax.f90,v 1.2 2004/04/01 15:48:31 teuler v8 $ |
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2 | ! JMFFTLIB : A library of portable fourier transform subroutines |
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3 | ! emulating Cray SciLib |
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4 | ! Author : Jean-Marie Teuler, CNRS, teuler@lcp.u-psud.fr |
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5 | ! |
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6 | ! Permission is granted to copy and distribute this file or modified |
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7 | ! versions of this file for no fee, provided the copyright notice and |
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8 | ! this permission notice are preserved on all copies. |
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9 | |
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10 | subroutine fftfax(n,ifax,trigs) |
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11 | |
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12 | implicit none |
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13 | |
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14 | ! Constantes pour les arguments |
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15 | integer, parameter :: nfax = 19 |
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16 | |
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17 | ! Arguments |
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18 | integer, intent(in) :: n |
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19 | real(kind=8), dimension(0:2*n-1), intent(out) :: trigs |
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20 | integer, dimension(0:nfax-1), intent(inout) :: ifax |
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21 | |
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22 | ! Variables locales |
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23 | integer :: ntrigs |
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24 | integer :: ifin |
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25 | character(len=*), parameter :: nomsp = 'FFTFAX' |
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26 | |
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27 | ! Positionnement a 0 du code de retour |
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28 | call jmsetcode(0) |
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29 | |
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30 | ntrigs = 2*n |
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31 | |
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32 | ! Factorisation de n dans ifax |
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33 | call jmfact(n,ifax,nfax,0,ifin) |
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34 | |
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35 | ! Preparation des tables |
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36 | call jmtable(trigs,ntrigs,0,n) |
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37 | |
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38 | end subroutine fftfax |
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