1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
| SUBROUTINE SVDCMP(A,M,N,MP,NP,W,V)
PARAMETER (NMAX=800)
DIMENSION A(MP,NP),W(NP),V(NP,NP),RV1(NMAX)
G=0.0
SCALE=0.0
ANORM=0.0
DO 25 I=1,N
L=I+1
RV1(I)=SCALE*G
G=0.0
S=0.0
SCALE=0.0
IF (I.LE.M) THEN
DO 11 K=I,M
SCALE=SCALE+ABS(A(K,I))
11 CONTINUE
IF (SCALE.NE.0.0) THEN
DO 12 K=I,M
A(K,I)=A(K,I)/SCALE
S=S+A(K,I)*A(K,I)
12 CONTINUE
F=A(I,I)
G=-SIGN(SQRT(S),F)
H=F*G-S
A(I,I)=F-G
IF (I.NE.N) THEN
DO 15 J=L,N
S=0.0
DO 13 K=I,M
S=S+A(K,I)*A(K,J)
13 CONTINUE
F=S/H
DO 14 K=I,M
A(K,J)=A(K,J)+F*A(K,I)
14 CONTINUE
15 CONTINUE
ENDIF
DO 16 K= I,M
A(K,I)=SCALE*A(K,I)
16 CONTINUE
ENDIF
ENDIF
W(I)=SCALE *G
G=0.0
S=0.0
SCALE=0.0
IF ((I.LE.M).AND.(I.NE.N)) THEN
DO 17 K=L,N
SCALE=SCALE+ABS(A(I,K))
17 CONTINUE
IF (SCALE.NE.0.0) THEN
DO 18 K=L,N
A(I,K)=A(I,K)/SCALE
S=S+A(I,K)*A(I,K)
18 CONTINUE
F=A(I,L)
G=-SIGN(SQRT(S),F)
H=F*G-S
A(I,L)=F-G
DO 19 K=L,N
RV1(K)=A(I,K)/H
19 CONTINUE
IF (I.NE.M) THEN
DO 23 J=L,M
S=0.0
DO 21 K=L,N
S=S+A(J,K)*A(I,K)
21 CONTINUE
DO 22 K=L,N
A(J,K)=A(J,K)+S*RV1(K)
22 CONTINUE
23 CONTINUE
ENDIF
DO 24 K=L,N
A(I,K)=SCALE*A(I,K)
24 CONTINUE
ENDIF
ENDIF
ANORM=MAX(ANORM,(ABS(W(I))+ABS(RV1(I))))
25 CONTINUE
DO 32 I=N,1,-1
IF (I.LT.N) THEN
IF (G.NE.0.0) THEN
DO 26 J=L,N
V(J,I)=(A(I,J)/A(I,L))/G
26 CONTINUE
DO 29 J=L,N
S=0.0
DO 27 K=L,N
S=S+A(I,K)*V(K,J)
27 CONTINUE
DO 28 K=L,N
V(K,J)=V(K,J)+S*V(K,I)
28 CONTINUE
29 CONTINUE
ENDIF
DO 31 J=L,N
V(I,J)=0.0
V(J,I)=0.0
31 CONTINUE
ENDIF
V(I,I)=1.0
G=RV1(I)
L=I
32 CONTINUE
DO 39 I=N,1,-1
L=I+1
G=W(I)
IF (I.LT.N) THEN
DO 33 J=L,N
A(I,J)=0.0
33 CONTINUE
ENDIF
IF (G.NE.0.0) THEN
G=1.0/G
IF (I.NE.N) THEN
DO 36 J=L,N
S=0.0
DO 34 K=L,M
S=S+A(K,I)*A(K,J)
34 CONTINUE
F=(S/A(I,I))*G
DO 35 K=I,M
A(K,J)=A(K,J)+F*A(K,I)
35 CONTINUE
36 CONTINUE
ENDIF
DO 37 J=I,M
A(J,I)=A(J,I)*G
37 CONTINUE
ELSE
DO 38 J= I,M
A(J,I)=0.0
38 CONTINUE
ENDIF
A(I,I)=A(I,I)+1.0
39 CONTINUE
DO 49 K=N,1,-1
DO 48 ITS=1,30
DO 41 L=K,1,-1
NM=L-1
IF ((ABS(RV1(L))+ANORM).EQ.ANORM) GO TO 2
IF ((ABS(W(NM))+ANORM).EQ.ANORM) GO TO 1
41 CONTINUE
1 C=0.0
S=1.0
DO 43 I=L,K
F=S*RV1(I)
IF ((ABS(F)+ANORM).NE.ANORM) THEN
G=W(I)
H=SQRT(F*F+G*G)
W(I)=H
H=1.0/H
C= (G*H)
S=-(F*H)
DO 42 J=1,M
Y=A(J,NM)
Z=A(J,I)
A(J,NM)=(Y*C)+(Z*S)
A(J,I)=-(Y*S)+(Z*C)
42 CONTINUE
ENDIF
43 CONTINUE
2 Z=W(K)
IF (L.EQ.K) THEN
IF (Z.LT.0.0) THEN
W(K)=-Z
DO 44 J=1,N
V(J,K)=-V(J,K)
44 CONTINUE
ENDIF
GO TO 3
ENDIF
IF (ITS.EQ.30) stop
!PAUSE 'No convergence in 30 iterations'
!pause
X=W(L)
NM=K-1
Y=W(NM)
G=RV1(NM)
H=RV1(K)
F=((Y-Z)*(Y+Z)+(G-H)*(G+H))/(2.0*H*Y)
G=SQRT(F*F+1.0)
F=((X-Z)*(X+Z)+H*((Y/(F+SIGN(G,F)))-H))/X
C=1.0
S=1.0
DO 47 J=L,NM
I=J+1
G=RV1(I)
Y=W(I)
H=S*G
G=C*G
Z=SQRT(F*F+H*H)
RV1(J)=Z
C=F/Z
S=H/Z
F= (X*C)+(G*S)
G=-(X*S)+(G*C)
H=Y*S
Y=Y*C
DO 45 NM=1,N
X=V(NM,J)
Z=V(NM,I)
V(NM,J)= (X*C)+(Z*S)
V(NM,I)=-(X*S)+(Z*C)
45 CONTINUE
Z=SQRT(F*F+H*H)
W(J)=Z
IF (Z.NE.0.0) THEN
Z=1.0/Z
C=F*Z
S=H*Z
ENDIF
F= (C*G)+(S*Y)
X=-(S*G)+(C*Y)
DO 46 NM=1,M
Y=A(NM,J)
Z=A(NM,I)
A(NM,J)= (Y*C)+(Z*S)
A(NM,I)=-(Y*S)+(Z*C)
46 CONTINUE
47 CONTINUE
RV1(L)=0.0
RV1(K)=F
W(K)=X
48 CONTINUE
3 CONTINUE
49 continue
RETURN
END |
Partager