[e200b7a] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | subroutine mean(x,xm,xs,number) |
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| 23 | |
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| 24 | !***************************************************************************** |
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| 25 | ! * |
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| 26 | ! This subroutine calculates mean and standard deviation of a given element.* |
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| 27 | ! * |
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| 28 | ! AUTHOR: Andreas Stohl, 25 January 1994 * |
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| 29 | ! * |
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| 30 | !***************************************************************************** |
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| 31 | ! * |
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| 32 | ! Variables: * |
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| 33 | ! x(number) field of input data * |
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| 34 | ! xm mean * |
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| 35 | ! xs standard deviation * |
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| 36 | ! number number of elements of field x * |
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| 37 | ! * |
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| 38 | ! Constants: * |
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| 39 | ! eps tiny number * |
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| 40 | ! * |
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| 41 | !***************************************************************************** |
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| 42 | |
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| 43 | implicit none |
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| 44 | |
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| 45 | integer :: number,i |
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| 46 | real :: x(number),xm,xs,xl,xq,xaux |
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| 47 | real,parameter :: eps=1.0e-30 |
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| 48 | |
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| 49 | xl=0. |
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| 50 | xq=0. |
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| 51 | do i=1,number |
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| 52 | xl=xl+x(i) |
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| 53 | xq=xq+x(i)*x(i) |
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| 54 | end do |
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| 55 | |
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| 56 | xm=xl/real(number) |
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| 57 | |
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| 58 | xaux=xq-xl*xl/real(number) |
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| 59 | |
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| 60 | if (xaux.lt.eps) then |
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| 61 | xs=0. |
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| 62 | else |
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| 63 | xs=sqrt(xaux/real(number-1)) |
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| 64 | endif |
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| 65 | |
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| 66 | end subroutine mean |
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