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annotate libcruft/arpack/src/ssortr.f @ 12194:470857149e61
import ARPACK sources to libcruft from Debian package libarpack2 2.1+parpack96.dfsg-3+b1
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 28 Jan 2011 14:04:33 -0500 |
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1 c----------------------------------------------------------------------- |
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2 c\BeginDoc |
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3 c |
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4 c\Name: ssortr |
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5 c |
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6 c\Description: |
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7 c Sort the array X1 in the order specified by WHICH and optionally |
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8 c applies the permutation to the array X2. |
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9 c |
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10 c\Usage: |
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11 c call ssortr |
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12 c ( WHICH, APPLY, N, X1, X2 ) |
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13 c |
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14 c\Arguments |
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15 c WHICH Character*2. (Input) |
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16 c 'LM' -> X1 is sorted into increasing order of magnitude. |
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17 c 'SM' -> X1 is sorted into decreasing order of magnitude. |
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18 c 'LA' -> X1 is sorted into increasing order of algebraic. |
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19 c 'SA' -> X1 is sorted into decreasing order of algebraic. |
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20 c |
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21 c APPLY Logical. (Input) |
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22 c APPLY = .TRUE. -> apply the sorted order to X2. |
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23 c APPLY = .FALSE. -> do not apply the sorted order to X2. |
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24 c |
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25 c N Integer. (INPUT) |
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26 c Size of the arrays. |
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27 c |
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28 c X1 Real array of length N. (INPUT/OUTPUT) |
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29 c The array to be sorted. |
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30 c |
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31 c X2 Real array of length N. (INPUT/OUTPUT) |
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32 c Only referenced if APPLY = .TRUE. |
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33 c |
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34 c\EndDoc |
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35 c |
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36 c----------------------------------------------------------------------- |
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37 c |
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38 c\BeginLib |
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39 c |
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40 c\Author |
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41 c Danny Sorensen Phuong Vu |
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42 c Richard Lehoucq CRPC / Rice University |
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43 c Dept. of Computational & Houston, Texas |
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44 c Applied Mathematics |
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45 c Rice University |
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46 c Houston, Texas |
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47 c |
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48 c\Revision history: |
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49 c 12/16/93: Version ' 2.1'. |
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50 c Adapted from the sort routine in LANSO. |
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51 c |
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52 c\SCCS Information: @(#) |
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53 c FILE: sortr.F SID: 2.3 DATE OF SID: 4/19/96 RELEASE: 2 |
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54 c |
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55 c\EndLib |
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56 c |
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57 c----------------------------------------------------------------------- |
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58 c |
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59 subroutine ssortr (which, apply, n, x1, x2) |
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60 c |
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61 c %------------------% |
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62 c | Scalar Arguments | |
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63 c %------------------% |
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64 c |
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65 character*2 which |
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66 logical apply |
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67 integer n |
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68 c |
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69 c %-----------------% |
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70 c | Array Arguments | |
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71 c %-----------------% |
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72 c |
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73 Real |
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74 & x1(0:n-1), x2(0:n-1) |
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75 c |
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76 c %---------------% |
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77 c | Local Scalars | |
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78 c %---------------% |
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79 c |
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80 integer i, igap, j |
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81 Real |
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82 & temp |
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83 c |
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84 c %-----------------------% |
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85 c | Executable Statements | |
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86 c %-----------------------% |
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87 c |
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88 igap = n / 2 |
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89 c |
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90 if (which .eq. 'SA') then |
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91 c |
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92 c X1 is sorted into decreasing order of algebraic. |
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93 c |
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94 10 continue |
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95 if (igap .eq. 0) go to 9000 |
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96 do 30 i = igap, n-1 |
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97 j = i-igap |
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98 20 continue |
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99 c |
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100 if (j.lt.0) go to 30 |
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101 c |
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102 if (x1(j).lt.x1(j+igap)) then |
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103 temp = x1(j) |
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104 x1(j) = x1(j+igap) |
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105 x1(j+igap) = temp |
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106 if (apply) then |
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107 temp = x2(j) |
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108 x2(j) = x2(j+igap) |
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109 x2(j+igap) = temp |
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110 end if |
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111 else |
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112 go to 30 |
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113 endif |
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114 j = j-igap |
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115 go to 20 |
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116 30 continue |
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117 igap = igap / 2 |
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118 go to 10 |
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119 c |
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120 else if (which .eq. 'SM') then |
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121 c |
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122 c X1 is sorted into decreasing order of magnitude. |
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123 c |
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124 40 continue |
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125 if (igap .eq. 0) go to 9000 |
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126 do 60 i = igap, n-1 |
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127 j = i-igap |
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128 50 continue |
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129 c |
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130 if (j.lt.0) go to 60 |
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131 c |
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132 if (abs(x1(j)).lt.abs(x1(j+igap))) then |
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133 temp = x1(j) |
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134 x1(j) = x1(j+igap) |
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135 x1(j+igap) = temp |
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136 if (apply) then |
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137 temp = x2(j) |
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138 x2(j) = x2(j+igap) |
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139 x2(j+igap) = temp |
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140 end if |
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141 else |
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142 go to 60 |
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143 endif |
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144 j = j-igap |
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145 go to 50 |
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146 60 continue |
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147 igap = igap / 2 |
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148 go to 40 |
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149 c |
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150 else if (which .eq. 'LA') then |
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151 c |
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152 c X1 is sorted into increasing order of algebraic. |
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153 c |
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154 70 continue |
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155 if (igap .eq. 0) go to 9000 |
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156 do 90 i = igap, n-1 |
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157 j = i-igap |
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158 80 continue |
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159 c |
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160 if (j.lt.0) go to 90 |
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161 c |
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162 if (x1(j).gt.x1(j+igap)) then |
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163 temp = x1(j) |
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164 x1(j) = x1(j+igap) |
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165 x1(j+igap) = temp |
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166 if (apply) then |
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167 temp = x2(j) |
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168 x2(j) = x2(j+igap) |
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169 x2(j+igap) = temp |
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170 end if |
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171 else |
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172 go to 90 |
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173 endif |
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174 j = j-igap |
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175 go to 80 |
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176 90 continue |
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177 igap = igap / 2 |
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178 go to 70 |
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179 c |
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180 else if (which .eq. 'LM') then |
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181 c |
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182 c X1 is sorted into increasing order of magnitude. |
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183 c |
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184 100 continue |
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185 if (igap .eq. 0) go to 9000 |
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186 do 120 i = igap, n-1 |
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187 j = i-igap |
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188 110 continue |
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189 c |
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190 if (j.lt.0) go to 120 |
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191 c |
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192 if (abs(x1(j)).gt.abs(x1(j+igap))) then |
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193 temp = x1(j) |
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194 x1(j) = x1(j+igap) |
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195 x1(j+igap) = temp |
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196 if (apply) then |
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197 temp = x2(j) |
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198 x2(j) = x2(j+igap) |
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199 x2(j+igap) = temp |
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200 end if |
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201 else |
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202 go to 120 |
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203 endif |
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204 j = j-igap |
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206 120 continue |
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207 igap = igap / 2 |
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208 go to 100 |
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209 end if |
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210 c |
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211 9000 continue |
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212 return |
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213 c |
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214 c %---------------% |
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215 c | End of ssortr | |
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216 c %---------------% |
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217 c |
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218 end |