1 | SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, value, & |
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2 | value_ijk, value1, value1_ijk ) |
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3 | |
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4 | !-------------------------------------------------------------------------------! |
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5 | ! Actual revisions: |
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6 | ! ----------------- |
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7 | ! |
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8 | ! |
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9 | ! Former revisions: |
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10 | ! ----------------- |
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11 | ! $Id: global_min_max.f90 4 2007-02-13 11:33:16Z heinze $ |
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12 | ! RCS Log replace by Id keyword, revision history cleaned up |
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13 | ! |
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14 | ! Revision 1.11 2003/04/16 12:56:58 raasch |
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15 | ! Index values of the extrema are limited to the range 0..nx, 0..ny |
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16 | ! |
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17 | ! Revision 1.1 1997/07/24 11:14:03 raasch |
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18 | ! Initial revision |
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19 | ! |
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20 | ! |
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21 | ! Description: |
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22 | ! ------------ |
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23 | ! Determine the array minimum/maximum and the corresponding indices. |
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24 | !-------------------------------------------------------------------------------! |
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25 | |
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26 | USE indices |
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27 | USE pegrid |
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28 | |
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29 | IMPLICIT NONE |
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30 | |
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31 | CHARACTER (LEN=*) :: mode |
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32 | |
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33 | INTEGER :: i, i1, i2, id_fmax, id_fmin, j, j1, j2, k, k1, k2, & |
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34 | fmax_ijk(3), fmax_ijk_l(3), fmin_ijk(3), & |
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35 | fmin_ijk_l(3), value_ijk(3) |
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36 | INTEGER, OPTIONAL :: value1_ijk(3) |
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37 | REAL :: value, & |
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38 | ar(i1:i2,j1:j2,k1:k2) |
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39 | #if defined( __ibm ) |
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40 | REAL (KIND=4) :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) ! on 32bit- |
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41 | ! machines MPI_2REAL must not be replaced by |
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42 | ! MPI_2DOUBLE_PRECISION |
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43 | #else |
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44 | REAL :: fmax(2), fmax_l(2), fmin(2), fmin_l(2) |
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45 | #endif |
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46 | REAL, OPTIONAL :: value1 |
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47 | |
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48 | |
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49 | ! |
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50 | !-- Determine array minimum |
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51 | IF ( mode == 'min' .OR. mode == 'minmax' ) THEN |
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52 | |
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53 | ! |
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54 | !-- Determine the local minimum |
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55 | fmin_ijk_l = MINLOC( ar ) |
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56 | fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - 1 ! MINLOC assumes lowerbound = 1 |
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57 | fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - 1 |
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58 | fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - 1 |
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59 | fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3)) |
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60 | |
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61 | #if defined( __parallel ) |
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62 | fmin_l(2) = myid |
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63 | CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, ierr ) |
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64 | |
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65 | ! |
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66 | !-- Determine the global minimum. Result stored on PE0. |
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67 | id_fmin = fmin(2) |
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68 | IF ( id_fmin /= 0 ) THEN |
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69 | IF ( myid == 0 ) THEN |
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70 | CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, & |
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71 | status, ierr ) |
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72 | ELSEIF ( myid == id_fmin ) THEN |
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73 | CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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74 | ENDIF |
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75 | ELSE |
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76 | fmin_ijk = fmin_ijk_l |
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77 | ENDIF |
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78 | ! |
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79 | !-- Send the indices of the just determined array minimum to other PEs |
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80 | CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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81 | #else |
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82 | fmin(1) = fmin_l(1) |
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83 | fmin_ijk = fmin_ijk_l |
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84 | #endif |
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85 | |
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86 | ENDIF |
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87 | |
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88 | ! |
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89 | !-- Determine array maximum |
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90 | IF ( mode == 'max' .OR. mode == 'minmax' ) THEN |
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91 | |
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92 | ! |
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93 | !-- Determine the local maximum |
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94 | fmax_ijk_l = MAXLOC( ar ) |
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95 | fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - 1 ! MAXLOC assumes lowerbound = 1 |
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96 | fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - 1 |
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97 | fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - 1 |
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98 | fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) |
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99 | |
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100 | #if defined( __parallel ) |
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101 | fmax_l(2) = myid |
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102 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, ierr ) |
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103 | |
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104 | ! |
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105 | !-- Determine the global maximum. Result stored on PE0. |
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106 | id_fmax = fmax(2) |
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107 | IF ( id_fmax /= 0 ) THEN |
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108 | IF ( myid == 0 ) THEN |
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109 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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110 | status, ierr ) |
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111 | ELSEIF ( myid == id_fmax ) THEN |
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112 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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113 | ENDIF |
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114 | ELSE |
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115 | fmax_ijk = fmax_ijk_l |
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116 | ENDIF |
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117 | ! |
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118 | !-- send the indices of the just determined array maximum to other PEs |
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119 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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120 | #else |
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121 | fmax(1) = fmax_l(1) |
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122 | fmax_ijk = fmax_ijk_l |
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123 | #endif |
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124 | |
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125 | ENDIF |
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126 | |
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127 | ! |
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128 | !-- Determine absolute array maximum |
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129 | IF ( mode == 'abs' ) THEN |
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130 | |
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131 | ! |
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132 | !-- Determine the local absolut maximum |
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133 | fmax_l(1) = 0.0 |
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134 | fmax_ijk_l(1) = i1 |
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135 | fmax_ijk_l(2) = j1 |
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136 | fmax_ijk_l(3) = k1 |
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137 | DO k = k1, k2 |
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138 | DO j = j1, j2 |
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139 | DO i = i1, i2 |
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140 | IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN |
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141 | fmax_l(1) = ABS( ar(i,j,k) ) |
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142 | fmax_ijk_l(1) = i |
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143 | fmax_ijk_l(2) = j |
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144 | fmax_ijk_l(3) = k |
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145 | ENDIF |
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146 | ENDDO |
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147 | ENDDO |
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148 | ENDDO |
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149 | |
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150 | ! |
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151 | !-- Set a flag in case that the determined value is negative. |
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152 | !-- A constant offset has to be subtracted in order to handle the special |
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153 | !-- case i=0 correctly |
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154 | IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0 ) THEN |
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155 | fmax_ijk_l(1) = -fmax_ijk_l(1) - 10 |
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156 | ENDIF |
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157 | |
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158 | #if defined( __parallel ) |
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159 | fmax_l(2) = myid |
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160 | CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, & |
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161 | ierr ) |
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162 | |
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163 | ! |
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164 | !-- Determine the global absolut maximum. Result stored on PE0. |
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165 | id_fmax = fmax(2) |
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166 | IF ( id_fmax /= 0 ) THEN |
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167 | IF ( myid == 0 ) THEN |
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168 | CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, & |
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169 | status, ierr ) |
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170 | ELSEIF ( myid == id_fmax ) THEN |
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171 | CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr ) |
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172 | ENDIF |
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173 | ELSE |
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174 | fmax_ijk = fmax_ijk_l |
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175 | ENDIF |
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176 | ! |
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177 | !-- Send the indices of the just determined absolut maximum to other PEs |
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178 | CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr ) |
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179 | #else |
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180 | fmax(1) = fmax_l(1) |
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181 | fmax_ijk = fmax_ijk_l |
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182 | #endif |
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183 | |
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184 | ENDIF |
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185 | |
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186 | ! |
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187 | !-- Determine output parameters |
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188 | SELECT CASE( mode ) |
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189 | |
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190 | CASE( 'min' ) |
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191 | |
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192 | value = fmin(1) |
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193 | value_ijk = fmin_ijk |
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194 | |
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195 | CASE( 'max' ) |
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196 | |
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197 | value = fmax(1) |
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198 | value_ijk = fmax_ijk |
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199 | |
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200 | CASE( 'minmax' ) |
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201 | |
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202 | value = fmin(1) |
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203 | value_ijk = fmin_ijk |
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204 | value1 = fmax(1) |
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205 | value1_ijk = fmax_ijk |
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206 | |
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207 | CASE( 'abs' ) |
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208 | |
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209 | value = fmax(1) |
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210 | value_ijk = fmax_ijk |
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211 | IF ( fmax_ijk(1) < 0 ) THEN |
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212 | value = -value |
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213 | value_ijk(1) = -value_ijk(1) - 10 |
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214 | ENDIF |
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215 | |
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216 | END SELECT |
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217 | |
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218 | ! |
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219 | !-- Limit index values to the range 0..nx, 0..ny |
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220 | IF ( value_ijk(3) == -1 ) value_ijk(3) = nx |
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221 | IF ( value_ijk(3) == nx+1 ) value_ijk(3) = 0 |
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222 | IF ( value_ijk(2) == -1 ) value_ijk(2) = ny |
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223 | IF ( value_ijk(2) == ny+1 ) value_ijk(2) = 0 |
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224 | |
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225 | |
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226 | END SUBROUTINE global_min_max |
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