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Last change
on this file was
1910,
checked in by Laurent Fairhead, 11 years ago
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Merged trunk changes r1860:1909 into testing branch
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-
Property copyright set to
Name of program: LMDZ
Creation date: 1984
Version: LMDZ5
License: CeCILL version 2
Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
See the license file in the root directory
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File size:
843 bytes
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| 1 | module cumprod_m |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | contains |
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| 6 | |
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| 7 | RECURSIVE FUNCTION cumprod(arr,seed) RESULT(ans) |
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| 8 | |
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| 9 | ! Cumulative product on an array, with optional multiplicative seed. |
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| 10 | |
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| 11 | USE nrtype, only: wp |
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| 12 | |
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| 13 | REAL(WP), DIMENSION(:), INTENT(IN) :: arr |
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| 14 | REAL(WP), OPTIONAL, INTENT(IN) :: seed |
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| 15 | REAL(WP), DIMENSION(size(arr)) :: ans |
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| 16 | |
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| 17 | ! Local: |
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| 18 | INTEGER n,j |
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| 19 | REAL(WP) :: sd |
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| 20 | INTEGER, PARAMETER :: NPAR_CUMPROD=8 |
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| 21 | |
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| 22 | !-------------------------------------------------------- |
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| 23 | |
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| 24 | n=size(arr) |
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| 25 | if (n == 0) RETURN |
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| 26 | sd=1.0_wp |
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| 27 | if (present(seed)) sd=seed |
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| 28 | ans(1)=arr(1)*sd |
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| 29 | if (n < NPAR_CUMPROD) then |
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| 30 | do j=2,n |
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| 31 | ans(j)=ans(j-1)*arr(j) |
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| 32 | end do |
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| 33 | else |
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| 34 | ans(2:n:2)=cumprod(arr(2:n:2)*arr(1:n-1:2),sd) |
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| 35 | ans(3:n:2)=ans(2:n-1:2)*arr(3:n:2) |
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| 36 | end if |
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| 37 | |
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| 38 | END FUNCTION cumprod |
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| 39 | |
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| 40 | end module cumprod_m |
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