Last change
on this file since 2594 was
2258,
checked in by Laurent Fairhead, 9 years ago
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Merged trunk changes 2216:2237 into testing branch
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File size:
1.1 KB
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1 | module principal_cshift_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 | subroutine principal_cshift(is2, xlon, xprimm) |
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8 | |
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9 | ! Add or subtract 2 pi so that xlon is near [-pi, pi], then cshift |
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10 | ! so that xlon is in ascending order. Make the same cshift on |
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11 | ! xprimm. |
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12 | |
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13 | use nrtype, only: twopi |
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14 | |
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15 | include "dimensions.h" |
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16 | ! for iim |
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17 | |
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18 | include "serre.h" |
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19 | ! for clon |
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20 | |
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21 | integer, intent(in):: is2 |
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22 | real, intent(inout):: xlon(:), xprimm(:) ! (iim + 1) |
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23 | |
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24 | !----------------------------------------------------- |
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25 | |
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26 | if (is2 /= 0) then |
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27 | IF (clon <= 0.) THEN |
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28 | IF (is2 /= 1) THEN |
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29 | xlon(:is2 - 1) = xlon(:is2 - 1) + twopi |
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30 | xlon(:iim) = cshift(xlon(:iim), shift = is2 - 1) |
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31 | xprimm(:iim) = cshift(xprimm(:iim), shift = is2 - 1) |
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32 | END IF |
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33 | else |
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34 | xlon(is2 + 1:iim) = xlon(is2 + 1:iim) - twopi |
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35 | xlon(:iim) = cshift(xlon(:iim), shift = is2) |
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36 | xprimm(:iim) = cshift(xprimm(:iim), shift = is2) |
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37 | end IF |
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38 | end if |
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39 | |
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40 | xlon(iim + 1) = xlon(1) + twopi |
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41 | xprimm(iim + 1) = xprimm(1) |
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42 | |
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43 | end subroutine principal_cshift |
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44 | |
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45 | end module principal_cshift_m |
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