| 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 2 | ! |
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| 3 | ! FFTPACK 5.0 |
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| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
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| 5 | ! University Corporation for Atmospheric Research |
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| 6 | ! Licensed under the GNU General Public License (GPL) |
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| 7 | ! |
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| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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| 9 | ! |
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| 10 | ! $Id: rfft2i.f,v 1.3 2004/06/15 21:29:20 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE RFFT2I (L, M, WSAVE, LENSAV, IER) |
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| 15 | INTEGER L, M, LENSAV, IER |
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| 16 | INTEGER LWSAV,MWSAV |
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| 17 | REAL WSAVE(LENSAV) |
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| 18 | ! |
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| 19 | ! Initialize IER |
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| 20 | ! |
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| 21 | IER = 0 |
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| 22 | ! |
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| 23 | ! Verify LENSAV |
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| 24 | ! |
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| 25 | LWSAV = L+INT(LOG(REAL(L)))+4 |
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| 26 | MWSAV = 2*M+INT(LOG(REAL(M)))+4 |
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| 27 | IF (LENSAV .LT. LWSAV+MWSAV) THEN |
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| 28 | IER = 2 |
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| 29 | CALL XERFFT ('RFFT2I', 4) |
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| 30 | GO TO 100 |
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| 31 | ENDIF |
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| 32 | ! |
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| 33 | CALL RFFTMI (L, WSAVE(1), L + INT(LOG(REAL(L))) + 4, IER1) |
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| 34 | IF (IER1 .NE. 0) THEN |
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| 35 | IER = 20 |
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| 36 | CALL XERFFT ('RFFT2I',-5) |
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| 37 | GO TO 100 |
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| 38 | ENDIF |
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| 39 | CALL CFFTMI (M, WSAVE(L+INT(LOG(REAL(L)))+5), & |
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| 40 | & 2*M+INT(LOG(REAL(M)))+4,IER1) |
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| 41 | IF (IER1 .NE. 0) THEN |
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| 42 | IER = 20 |
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| 43 | CALL XERFFT ('RFFT2I',-5) |
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| 44 | ENDIF |
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| 45 | ! |
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| 46 | 100 CONTINUE |
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| 47 | RETURN |
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| 48 | END |
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