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 | module mean_mod |
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23 | public |
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24 | |
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25 | ! Interface to select single or double precision version of the 'mean' |
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26 | ! function from type of input arguments ("function overloading") |
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27 | !******************************************************************** |
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28 | interface mean |
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29 | module procedure mean_sp |
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30 | module procedure mean_dp |
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31 | module procedure mean_mixed_prec |
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32 | end interface mean |
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33 | |
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34 | contains |
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35 | |
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36 | subroutine mean_sp(x_sp,xm,xs,number) |
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37 | |
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38 | !***************************************************************************** |
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39 | ! * |
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40 | ! This subroutine calculates mean and standard deviation of a given element.* |
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41 | ! * |
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42 | ! AUTHOR: Andreas Stohl, 25 January 1994 * |
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43 | ! * |
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44 | ! Single precision version ESO 2016 * |
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45 | !***************************************************************************** |
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46 | ! * |
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47 | ! Variables: * |
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48 | ! x_sp(number) field of input data * |
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49 | ! xm mean * |
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50 | ! xs standard deviation * |
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51 | ! number number of elements of field x_sp * |
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52 | ! * |
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53 | ! Constants: * |
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54 | ! eps tiny number * |
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55 | ! * |
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56 | !***************************************************************************** |
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57 | |
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58 | use par_mod, only: sp |
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59 | |
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60 | implicit none |
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61 | |
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62 | ! integer :: number,i |
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63 | ! real(sp) :: x_sp(number),xm,xs,xl,xq,xaux |
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64 | ! real(sp),parameter :: eps=1.0e-30 |
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65 | |
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66 | real(sp), intent(in) :: x_sp(number) |
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67 | real(sp), intent(out) ::xm,xs |
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68 | integer,intent(in) :: number |
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69 | real(sp) :: xl,xq,xaux |
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70 | real(sp),parameter :: eps=1.0e-30 |
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71 | integer :: i |
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72 | |
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73 | xl=0. |
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74 | xq=0. |
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75 | do i=1,number |
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76 | xl=xl+x_sp(i) |
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77 | xq=xq+x_sp(i)*x_sp(i) |
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78 | end do |
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79 | |
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80 | xm=xl/real(number,kind=sp) |
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81 | |
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82 | xaux=xq-xl*xl/real(number,kind=sp) |
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83 | |
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84 | if (xaux.lt.eps) then |
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85 | xs=0. |
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86 | else |
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87 | xs=sqrt(xaux/real(number-1,kind=sp)) |
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88 | endif |
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89 | |
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90 | end subroutine mean_sp |
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91 | |
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92 | subroutine mean_dp(x_dp,xm,xs,number) |
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93 | |
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94 | !***************************************************************************** |
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95 | ! * |
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96 | ! This subroutine calculates mean and standard deviation of a given element.* |
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97 | ! * |
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98 | ! AUTHOR: Andreas Stohl, 25 January 1994 * |
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99 | ! * |
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100 | ! Double precision version ESO 2016 * |
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101 | !***************************************************************************** |
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102 | ! * |
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103 | ! Variables: * |
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104 | ! x_dp(number) field of input data * |
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105 | ! xm mean * |
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106 | ! xs standard deviation * |
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107 | ! number number of elements of field x_dp * |
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108 | ! * |
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109 | ! Constants: * |
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110 | ! eps tiny number * |
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111 | ! * |
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112 | !***************************************************************************** |
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113 | |
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114 | use par_mod, only: dp |
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115 | |
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116 | implicit none |
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117 | |
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118 | real(dp), intent(in) :: x_dp(number) |
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119 | real(dp), intent(out) ::xm,xs |
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120 | integer,intent(in) :: number |
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121 | real(dp) :: xl,xq,xaux |
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122 | real(dp),parameter :: eps=1.0e-30 |
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123 | integer :: i |
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124 | |
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125 | xl=0._dp |
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126 | xq=0._dp |
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127 | do i=1,number |
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128 | xl=xl+x_dp(i) |
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129 | xq=xq+x_dp(i)*x_dp(i) |
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130 | end do |
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131 | |
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132 | xm=xl/real(number,kind=dp) |
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133 | |
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134 | xaux=xq-xl*xl/real(number,kind=dp) |
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135 | |
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136 | if (xaux.lt.eps) then |
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137 | xs=0._dp |
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138 | else |
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139 | xs=sqrt(xaux/real(number-1,kind=dp)) |
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140 | endif |
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141 | |
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142 | end subroutine mean_dp |
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143 | |
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144 | subroutine mean_mixed_prec(x_dp,xm,xs,number) |
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145 | |
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146 | !***************************************************************************** |
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147 | ! * |
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148 | ! This subroutine calculates mean and standard deviation of a given element.* |
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149 | ! * |
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150 | ! AUTHOR: Andreas Stohl, 25 January 1994 * |
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151 | ! * |
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152 | ! Mixed precision version ESO 2016 (dp input, sp output) * |
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153 | !***************************************************************************** |
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154 | ! * |
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155 | ! Variables: * |
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156 | ! x_dp(number) field of input data * |
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157 | ! xm mean * |
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158 | ! xs standard deviation * |
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159 | ! number number of elements of field x_dp * |
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160 | ! * |
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161 | ! Constants: * |
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162 | ! eps tiny number * |
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163 | ! * |
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164 | !***************************************************************************** |
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165 | |
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166 | use par_mod, only: sp,dp |
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167 | |
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168 | implicit none |
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169 | |
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170 | real(dp), intent(in) :: x_dp(number) |
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171 | real(sp), intent(out) ::xm,xs |
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172 | integer,intent(in) :: number |
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173 | real(sp) :: xl,xq,xaux |
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174 | real(sp),parameter :: eps=1.0e-30 |
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175 | integer :: i |
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176 | |
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177 | xl=0._sp |
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178 | xq=0._sp |
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179 | do i=1,number |
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180 | xl=xl+x_dp(i) |
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181 | xq=xq+x_dp(i)*x_dp(i) |
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182 | end do |
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183 | |
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184 | xm=xl/real(number,kind=sp) |
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185 | |
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186 | xaux=xq-xl*xl/real(number,kind=sp) |
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187 | |
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188 | if (xaux.lt.eps) then |
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189 | xs=0._sp |
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190 | else |
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191 | xs=sqrt(xaux/real(number-1,kind=sp)) |
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192 | endif |
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193 | |
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194 | end subroutine mean_mixed_prec |
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195 | end module mean_mod |
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