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1996-09-28
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395 lines
C
C THIS DRIVER TESTS EISPACK FOR THE CLASS OF REAL SYMMETRIC
C MATRICES SUMMARIZING THE FIGURES OF MERIT FOR ALL PATHS.
C
C THIS DRIVER IS CATALOGUED AS EISPDRV4(RSSUMARY).
C
C THE DIMENSION OF A AND Z SHOULD BE NM BY NM.
C THE DIMENSION OF W,D,E,E2,IND,RV1,RV2,RV3,RV4,RV5,RV6,
C W1, AND W2 SHOULD BE NM.
C THE DIMENSION OF AHOLD SHOULD BE NM BY NM.
C HERE NM = 20.
C
C 4-28-92: MODIFIED CALLS TO RS AND TRED1 TO PASS SEPARATE ARRAYS
C TO THE DUMMY ARGUMENTS E AND E2. (ECA)
C
REAL A(20,20),Z(20,20),AHOLD(20,20),W(20),D(20),E(20),
X E2( 20),RV1( 20),RV2( 20),RV3( 20),RV4( 20),RV5( 20),
X RV6( 20),W1( 20),W2( 20),TCRIT( 8),EPSLON,RESDUL,MAXEIG,
X MAXDIF,U,LB,UB,EPS1,FWORK(1600),DFL
REAL XUB,XLB
INTEGER IND( 20),IERR( 6),ERROR
DATA IREAD1/1/,IREADC/5/,IWRITE/6/
C
OPEN(UNIT=IREAD1,FILE='FILE35')
OPEN(UNIT=IREADC,FILE='FILE36')
REWIND IREAD1
REWIND IREADC
C
NM = 20
LCOUNT = 0
WRITE(IWRITE,1)
1 FORMAT(1H1,19X,57H EXPLANATION OF COLUMN ENTRIES FOR THE SUMMARY S
XTATISTICS//1H ,95(1H-)/96H ORDER TQL2 TQLRAT IMTQL2 IMTQL1 LB
X UB M IMTQLV TSTURM BISECT M1 NO TRIDIB /1H ,
X95(1H-)//48H UNDER 'ORDER' IS THE ORDER OF EACH TEST MATRIX. //
X95H UNDER 'TQL2 TQLRAT' ARE THREE NUMBERS. THE FIRST NUMBER, AN
X INTEGER, IS THE ABSOLUTE SUM OF/
X61H THE ERROR FLAGS RETURNED SEPARATELY FROM TQL2 AND TQLRAT.,
X33H THE SECOND NUMBER IS THE MEASURE/
X62H OF PERFORMANCE BASED UPON THE RESIDUAL COMPUTED FOR THE TQL2,
X25H PATH. THE THIRD NUMBER /
X62H MEASURES THE AGREEMENT OF THE EIGENVALUES FROM THE TQL2 AND,
X16H TQLRAT PATHS. //
X95H UNDER 'IMTQL2 IMTQL1' ARE THREE NUMBERS WITH MEANING LIKE THOS
XE UNDER 'TQL2 TQLRAT'. //
X95H UNDER 'LB' AND 'UB' ARE THE INPUT VARIABLES SPECIFYING THE INT
XERVAL TO BISECT AND TSTURM. //
X61H UNDER 'M' IS THE NUMBER OF EIGENVALUES DETERMINED BY BISECT,
X29H AND TSTURM THAT LIE IN THE /18H INTERVAL (LB,UB).//
X95H UNDER EACH OF 'IMTQLV', 'TSTURM', 'BISECT', AND 'TRIDIB' ARE T
XWO NUMBERS. THE FIRST NUMBER, )
WRITE(IWRITE,2)
2 FORMAT(
X95H AN INTEGER, IS THE ABSOLUTE SUM OF THE ERROR FLAGS RETURNED FR
XOM THE RESPECTIVE PATH. /
X95H THE SECOND NUMBER IS THE MEASURE OF PERFORMANCE BASED UPON THE
X RESIDUAL COMPUTED FOR THE PATH.//
X95H UNDER 'M1' AND 'NO' ARE THE VARIABLES SPECIFYING THE LOWER BOU
XNDARY INDEX AND THE NUMBER /
X28H OF EIGENVALUES TO TRIDIB. //
X62H -1.0 AS THE MEASURE OF PERFORMANCE IS PRINTED IF AN ERROR IN,
X27H THE CORRESPONDING PATH HAS /
X47H PREVENTED THE COMPUTATION OF THE EIGENVECTORS. //
X62H THE TQL2 PATH USES THE EISPACK CODES TRED2-TQL2 , /
X38H AS CALLED FROM DRIVER SUBROUTINE RS. /
X62H THE TQLRAT PATH USES THE EISPACK CODES TRED1-TQLRAT, /
X38H AS CALLED FROM DRIVER SUBROUTINE RS. /
X62H THE IMTQL2 PATH USES THE EISPACK CODES TRED2-IMTQL2. /
X62H THE IMTQL1 PATH USES THE EISPACK CODES TRED1-IMTQL1. /
X63H THE IMTQLV PATH USES THE EISPACK CODES TRED1-IMTQLV-TINVIT
X ,8H-TRBAK , /
X38H AS CALLED FROM DRIVER SUBROUTINE RSM. )
WRITE(IWRITE,3)
3 FORMAT(
X64H THE TSTURM PATH USES THE EISPACK CODES TRED1-TSTURM-TRBAK1
X. /
X63H THE BISECT PATH USES THE EISPACK CODES TRED1-BISECT-TINVIT
X ,8H-TRBAK1. /
X63H THE TRIDIB PATH USES THE EISPACK CODES TRED1-TRIDIB-TINVIT
X ,8H-TRBAK1. /)
WRITE(IWRITE,15)
15 FORMAT(1X,21HS.P. VERSION 04/15/83 )
5 FORMAT( 53H1 TABULATION OF THE ERROR FLAG ERROR AND THE ,
X 31HMEASURE OF PERFORMANCE Y FOR /5X,
X 56HTHE EISPACK CODES. THIS RUN DISPLAYS THESE STATISTICS ,
X 33H FOR REAL SYMMETRIC MATRICES. /
X 55H0ORDER TQL2 TQLRAT IMTQL2 IMTQL1 LB UB M ,
X 40HIMTQLV TSTURM BISECT M1 NO TRIDIB )
10 CALL RMATIN(NM,N,A,AHOLD,0)
READ(IREADC,50) MM,LB,UB,M11,NO
50 FORMAT(I4,2D24.16,2(4X,I4))
C
C MM,LB,UB,M11, AND NO ARE READ FROM SYSIN AFTER THE MATRIX IS
C GENERATED. MM,LB, AND UB SPECIFY TO BISECT THE MAXIMUM
C NUMBER OF EIGENVALUES AND THE BOUNDS FOR THE INTERVAL WHICH IS
C TO BE SEARCHED. M11 AND NO SPECIFY TO TRIDIB THE LOWER
C BOUNDARY INDEX AND THE NUMBER OF DESIRED EIGENVALUES.
C
DO 230 ICALL = 1,10
IF( ICALL .NE. 1 ) CALL RMATIN(NM,N,A,AHOLD,1)
C
C IF TQLRAT PATH (LABEL 80) IS TAKEN THEN TQL2 PATH (LABEL 70)
C MUST ALSO BE TAKEN IN ORDER THAT THE MEASURE OF PERFORMANCE BE
C MEANINGFUL.
C IF IMTQL1 PATH (LABEL 85) IS TAKEN THEN IMTQL2 PATH (LABEL 75)
C MUST ALSO BE TAKEN IN ORDER THAT THE MEASURE OF PERFORMANCE BE
C MEANINGFUL.
C IF TQL2 (IMTQL2) PATH FAILS, THEN TQLRAT (IMTQL1) PATH IS
C OMITTED AND PRINTOUT FLAGGED WITH -1.0.
C
GO TO (70,75,80,85,89,90,95,230,110,230), ICALL
C
C RSWZ USING TQL2
C INVOKED FROM DRIVER SUBROUTINE RS.
C
70 ICT = 1
CALL RS(NM,N,A,W,1,Z,E,E2,ERROR)
IERR(ICT) = ERROR
M = ERROR - 1
IF( ERROR .NE. 0 ) GO TO 190
DO 73 I=1,N
73 W1(I) = W(I)
M = N
GO TO 190
C
C RSWZ USING IMTQL2
C
75 ICT = 2
CALL TRED2(NM,N,A,W,E,Z)
CALL IMTQL2(NM,N,W,E,Z,ERROR)
IERR(ICT) = ERROR
M = ERROR - 1
IF( ERROR .NE. 0 ) GO TO 190
DO 76 I = 1,N
W2(I) = W(I)
76 CONTINUE
M = N
GO TO 190
C
C RSW USING TQLRAT
C INVOKED FROM DRIVER SUBROUTINE RS.
C
80 ICT = 7
IF( IERR(1) .NE. 0 ) GO TO 200
CALL RS(NM,N,A,W,0,A,E,E2,ERROR)
IERR(1) = ERROR
IF( ERROR .NE. 0 ) GO TO 200
MAXEIG = 0.0E0
MAXDIF = 0.0E0
DO 81 I = 1,N
IF( ABS(W(I)) .GT. MAXEIG ) MAXEIG = ABS(W(I))
U = ABS(W1(I) - W(I))
IF( U .GT. MAXDIF ) MAXDIF = U
81 CONTINUE
IF( MAXEIG .EQ. 0.0E0 ) MAXEIG = 1.0E0
DFL = 10 * N
TCRIT(7) = MAXDIF/EPSLON(MAXEIG*DFL)
GO TO 230
C
C RSW USING IMTQL1
C
85 ICT = 8
IF( IERR(2) .NE. 0 ) GO TO 200
CALL TRED1(NM,N,A,W,E,E2)
CALL IMTQL1(N,W,E,ERROR)
IERR(2) = ERROR
MAXEIG = 0.0E0
MAXDIF = 0.0E0
DO 86 I = 1,N
IF( ABS(W(I)) .GT. MAXEIG ) MAXEIG = ABS(W(I))
U = ABS(W2(I) - W(I))
IF( U .GT. MAXDIF ) MAXDIF = U
86 CONTINUE
IF( MAXEIG .EQ. 0.0E0 ) MAXEIG = 1.0E0
DFL = 10 * N
TCRIT(8) = MAXDIF/EPSLON(MAXEIG*DFL)
GO TO 230
C
C RSW1Z ( USAGE HERE COMPUTES ALL THE EIGENVECTORS )
C INVOKED FROM DRIVER SUBROUTINE RSM.
C
89 ICT = 3
M = N
CALL RSM(NM,N,A,W,M,Z,FWORK,IND,ERROR)
IERR(ICT) = IABS(ERROR)
GO TO 190
C
C RS1W1Z USING TSTURM
C
90 ICT = 4
EPS1 = 0.0E0
CALL TRED1(NM,N,A,D,E,E2)
CALL TSTURM(NM,N,EPS1,D,E,E2,LB,UB,MM,M,W,Z,ERROR,
X RV1,RV2,RV3,RV4,RV5,RV6)
IERR(ICT) = ERROR
XLB = LB
XUB = UB
IF( ERROR .EQ. 3*N + 1 ) GO TO 200
IF( ERROR .GT. 4*N ) M = ERROR - 4*N - 1
CALL TRBAK1(NM,N,A,E,M,Z)
GO TO 190
C
C RS1W1Z USING BISECT AND TINVIT
C
95 ICT = 5
EPS1 = 0.0E0
CALL TRED1(NM,N,A,D,E,E2)
CALL BISECT(N,EPS1,D,E,E2,LB,UB,MM,M,W,IND,ERROR,RV4,RV5)
IERR(ICT) = ERROR
MBISCT = M
XLB = LB
XUB = UB
IF( ERROR .NE. 0 ) GO TO 200
CALL TINVIT(NM,N,D,E,E2,M,W,IND,Z,ERROR,RV1,RV2,RV3,RV4,RV6)
IERR(ICT) = IABS(ERROR)
CALL TRBAK1(NM,N,A,E,M,Z)
GO TO 190
C
C RS1W1Z USING TRIDIB AND TINVIT
C
110 ICT = 6
EPS1 = 0.0E0
CALL TRED1(NM,N,A,D,E,E2)
CALL TRIDIB(N,EPS1,D,E,E2,LB,UB,M11,NO,W,IND,ERROR,RV4,RV5)
IERR(ICT) = ERROR
IF( ERROR .NE. 0 ) GO TO 200
M = NO
CALL TINVIT(NM,N,D,E,E2,M,W,IND,Z,ERROR,RV1,RV2,RV3,RV4,RV6)
IERR(ICT) = IABS(ERROR)
CALL TRBAK1(NM,N,A,E,M,Z)
C
190 IF( M .EQ. 0 .AND. ERROR .NE. 0 ) GO TO 200
CALL RSWZR(NM,N,M,AHOLD,W,Z,RV1,RESDUL)
DFL = 10 * N
TCRIT(ICT) = RESDUL/EPSLON(DFL)
GO TO 230
200 TCRIT(ICT) = -1.0E0
230 CONTINUE
C
IF( MOD(LCOUNT,35) .EQ. 0 ) WRITE(IWRITE,5)
LCOUNT = LCOUNT + 1
WRITE(IWRITE,240) N,IERR(1),TCRIT(1),TCRIT(7),IERR(2),TCRIT(2),
X TCRIT(8),XLB,XUB,MBISCT,(IERR(I),TCRIT(I),I=3,5),
X M11,NO,IERR(6),TCRIT(6)
240 FORMAT(I4,2(I3,2F6.3),2(1PE8.0),I3,3(I3,0PF6.3),3I3,F6.3)
GO TO 10
END
SUBROUTINE RSWZR(NM,N,M,A,W,Z,NORM,RESDUL)
C
REAL NORM(M),W(M),A(NM,N),Z(NM,M),NORMA,TNORM,S,SUM,
X SUMZ, SUMA, RESDUL
C
C THIS SUBROUTINE FORMS THE 1-NORM OF THE RESIDUAL MATRIX
C A*Z-Z*DIAG(W) WHERE A IS A REAL SYMMETRIC MATRIX, W IS
C A VECTOR WHICH CONTAINS M EIGENVALUES OF A, AND Z
C IS AN ARRAY WHICH CONTAINS THE M CORRESPONDING EIGENVECTORS OF
C OF A. ALL NORMS APPEARING IN THE COMMENTS BELOW ARE 1-NORMS.
C
C THIS SUBROUTINE IS CATALOGUED AS EISPDRV4(RSWZR).
C
C INPUT.
C
C NM IS THE ROW DIMENSION OF TWO-DIMENSIONAL ARRAY PARAMETERS
C AS DECLARED IN THE CALLING PROGRAM DIMENSION STATEMENT;
C
C M IS THE NUMBER OF EIGENVECTORS FOR WHICH RESIDUALS ARE
C DESIRED;
C
C N IS THE ORDER OF THE MATRIX A;
C
C A(NM,N) IS A REAL SYMMETRIC MATRIX. ONLY THE FULL UPPER
C TRIANGLE NEED BE SUPPLIED;
C
C Z(NM,M) IS A REAL MATRIX WHOSE FIRST M COLUMNS CONTAIN THE
C APPROXIMATE EIGENVECTORS OF A;
C
C W(M) IS A VECTOR WHOSE FIRST M COMPONENTS CONTAIN THE
C APPROXIMATE EIGENVALUES OF A. W(I) IS ASSOCIATED WITH THE
C I-TH COLUMN OF Z.
C
C OUTPUT.
C
C Z(NM,M) IS AN ARRAY WHICH CONTAINS M NORMALIZED
C APPROXIMATE EIGENVECTORS OF A. THE EIGENVECTORS ARE
C NORMALIZED USING THE 1-NORM IN SUCH A WAY THAT THE FIRST
C ELEMENT WHOSE MAGNITUDE IS LARGER THAN THE NORM OF THE
C EIGENVECTOR DIVIDED BY N IS POSITIVE;
C
C A(NM,N) IS ALTERED BY MAKING THE LOWER TRIANGLE OF A
C SYMMETRIC WITH THE UPPER TRIANGLE OF A;
C
C NORM(M) IS AN ARRAY SUCH THAT FOR EACH K,
C NORM(K) = !!A*Z(K)-Z(K)*W(K)!!/(!!A!!*!!Z(K)!!)
C WHERE Z(K) IS THE K-TH EIGENVECTOR;
C
C RESDUL IS THE REAL NUMBER
C !!A*Z-Z*DIAG(W)!!/(!!A!!*!!Z!!).
C
C ----------------------------------------------------------------
C
RESDUL = 0.0E0
IF( M .EQ. 0 ) RETURN
NORMA = 0.0E0
C
DO 40 I=1,N
SUMA = 0.0E0
IF(I .EQ. 1) GO TO 20
C
DO 10 L=2,I
A(I,L-1) = A(L-1,I)
10 CONTINUE
C
20 DO 30 L=1,N
30 SUMA = SUMA + ABS(A(I,L))
C
40 NORMA = AMAX1(NORMA,SUMA)
C
IF(NORMA .EQ. 0.0E0) NORMA = 1.0E0
C
DO 100 I=1,M
S = 0.0E0
SUMZ = 0.0E0
C
DO 60 L=1,N
SUMZ = SUMZ + ABS(Z(L,I))
SUM = -W(I)*Z(L,I)
C
DO 50 K=1,N
50 SUM = SUM + A(L,K)*Z(K,I)
C
60 S = S + ABS(SUM)
C
NORM(I) = SUMZ
IF( SUMZ .EQ. 0.0E0 ) GO TO 100
C ..........THIS LOOP WILL NEVER BE COMPLETED SINCE THERE
C WILL ALWAYS EXIST AN ELEMENT IN THE VECTOR Z(I)
C LARGER THAN !!Z(I)!!/N..........
DO 70 L=1,N
IF(ABS(Z(L,I)) .GE. NORM(I)/N) GO TO 80
70 CONTINUE
C
80 TNORM = SIGN(NORM(I),Z(L,I))
C
DO 90 L=1,N
90 Z(L,I) = Z(L,I)/TNORM
C
NORM(I) = S/(NORM(I)*NORMA)
100 RESDUL = AMAX1(NORM(I), RESDUL)
C
RETURN
END
SUBROUTINE RMATIN(NM,N,A,AHOLD,INITIL)
C
C THIS INPUT SUBROUTINE READS A REAL MATRIX FROM SYSIN OF
C ORDER N.
C TO GENERATE THE MATRIX A INITIALLY, INITIL IS TO BE 0.
C TO REGENERATE THE MATRIX A FOR THE PURPOSE OF THE RESIDUAL
C CALCULATION, INITIL IS TO BE 1.
C
C THIS ROUTINE IS CATALOGUED AS EISPDRV4(RGREADI).
C
REAL A(NM,NM),AHOLD(NM,NM)
INTEGER IA( 20)
DATA IREADA/1/,IWRITE/6/
C
IF( INITIL .EQ. 1 ) GO TO 30
READ(IREADA,5)N, M
5 FORMAT(I6,6X,I6)
IF( N .EQ. 0 ) GO TO 70
IF (M .NE. 1) GO TO 14
DO 13 I = 1,N
READ(IREADA,16) (IA(J), J=I,N)
DO 12 J = I,N
A(I,J) = IA(J)
12 A(J,I) = A(I,J)
13 CONTINUE
GO TO 19
14 DO 17 I = 1,N
READ(IREADA,16) (IA(J), J=1,N)
16 FORMAT(6I12)
DO 17 J = 1,N
17 A(I,J) = IA(J)
19 DO 20 I = 1,N
DO 20 J = 1,N
20 AHOLD(I,J) = A(I,J)
RETURN
30 DO 40 I = 1,N
DO 40 J = 1,N
40 A(I,J) = AHOLD(I,J)
RETURN
70 WRITE(IWRITE,80)
80 FORMAT(46H0END OF DATA FOR SUBROUTINE RMATIN(RGREADI). /1H1)
STOP
END