*     F02WEF Example Program Text
*     Mark 14 Revised. NAG Copyright 1989.
*     .. Parameters ..
      INTEGER          NOUT
      PARAMETER        (NOUT=6)
*     .. External Subroutines ..
      EXTERNAL         EX1, EX2
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F02WEF Example Program Results'
      CALL EX1
      CALL EX2
      END
*
      SUBROUTINE EX1
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          MMAX, NMAX, NCOLB
      PARAMETER        (MMAX=20,NMAX=10,NCOLB=1)
      INTEGER          LDA, LDB, LDPT
      PARAMETER        (LDA=MMAX,LDB=MMAX,LDPT=NMAX)
      INTEGER          LWORK
      PARAMETER        (LWORK=NMAX**2+5*(NMAX-1))
*     .. Local Scalars ..
      INTEGER          I, IFAIL, J, LDDUM, M, N
      LOGICAL          WANTP, WANTQ
*     .. Local Arrays ..
      DOUBLE PRECISION A(LDA,NMAX), B(LDB), DUMMY(1), PT(LDPT,NMAX),
     +                 SV(NMAX), WORK(LWORK)
*     .. External Subroutines ..
      EXTERNAL         F02WEF
*     .. Executable Statements ..
      WRITE (NOUT,*)
      WRITE (NOUT,*)
      WRITE (NOUT,*) 'Example 1'
      WRITE (NOUT,*)
*     Skip heading in data file
      READ (NIN,*)
      READ (NIN,*)
      READ (NIN,*)
      READ (NIN,*) M, N
      IF ((M.GT.MMAX) .OR. (N.GT.NMAX)) THEN
         WRITE (NOUT,*) 'M or N is out of range.'
         WRITE (NOUT,99999) 'M = ', M, '   N = ', N
      ELSE
         READ (NIN,*) ((A(I,J),J=1,N),I=1,M)
         READ (NIN,*) (B(I),I=1,M)
*        Find the SVD of A.
         WANTQ = .TRUE.
         LDDUM = 1
         WANTP = .TRUE.
         IFAIL = 1
*
         CALL F02WEF(M,N,A,LDA,NCOLB,B,LDB,WANTQ,DUMMY,LDDUM,SV,WANTP,
     +               PT,LDPT,WORK,IFAIL)
*
         IF (IFAIL.EQ.0) THEN
            WRITE (NOUT,*) 'Singular value decomposition of A'
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Singular values'
            WRITE (NOUT,99998) (SV(I),I=1,N)
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Left-hand singular vectors, by column'
            DO 20 I = 1, M
               WRITE (NOUT,99998) (A(I,J),J=1,N)
   20       CONTINUE
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Right-hand singular vectors, by column'
            DO 40 I = 1, N
               WRITE (NOUT,99998) (PT(J,I),J=1,N)
   40       CONTINUE
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Vector Q''*B'
            WRITE (NOUT,99998) (B(I),I=1,M)
         ELSE
            WRITE (NOUT,99997) IFAIL
         END IF
      END IF
*
99999 FORMAT (1X,A,I5,A,I5)
99998 FORMAT (5(1X,F8.4))
99997 FORMAT (1X,/1X,' ** F02WEF returned with IFAIL = ',I5)
      END
*
      SUBROUTINE EX2
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          MMAX, NMAX
      PARAMETER        (MMAX=10,NMAX=20)
      INTEGER          LDA, LDQ
      PARAMETER        (LDA=MMAX,LDQ=MMAX)
      INTEGER          LWORK
      PARAMETER        (LWORK=MMAX**2+5*(MMAX-1))
*     .. Local Scalars ..
      INTEGER          I, IFAIL, J, LDDUM, M, N, NCOLB
      LOGICAL          WANTP, WANTQ
*     .. Local Arrays ..
      DOUBLE PRECISION A(LDA,NMAX), DUMMY(1), Q(LDQ,MMAX), SV(MMAX),
     +                 WORK(LWORK)
*     .. External Subroutines ..
      EXTERNAL         F02WEF
*     .. Executable Statements ..
      WRITE (NOUT,*)
      WRITE (NOUT,*)
      WRITE (NOUT,*) 'Example 2'
*     Skip heading in data file
      READ (NIN,*)
      READ (NIN,*)
      READ (NIN,*) M, N
      WRITE (NOUT,*)
      IF ((M.GT.MMAX) .OR. (N.GT.NMAX)) THEN
         WRITE (NOUT,*) 'M or N is out of range.'
         WRITE (NOUT,99999) 'M = ', M, '   N = ', N
      ELSE
         READ (NIN,*) ((A(I,J),J=1,N),I=1,M)
*        Find the SVD of A.
         LDDUM = 1
         WANTQ = .TRUE.
         WANTP = .TRUE.
         NCOLB = 0
         IFAIL = 1
*
         CALL F02WEF(M,N,A,LDA,NCOLB,DUMMY,LDDUM,WANTQ,Q,LDQ,SV,WANTP,
     +               DUMMY,LDDUM,WORK,IFAIL)
*
         IF (IFAIL.EQ.0) THEN
            WRITE (NOUT,*) 'Singular value decomposition of A'
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Singular values'
            WRITE (NOUT,99998) (SV(I),I=1,M)
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Left-hand singular vectors, by column'
            DO 20 I = 1, M
               WRITE (NOUT,99998) (Q(I,J),J=1,M)
   20       CONTINUE
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Right-hand singular vectors, by column'
            DO 40 I = 1, N
               WRITE (NOUT,99998) (A(J,I),J=1,M)
   40       CONTINUE
         ELSE
            WRITE (NOUT,99997) IFAIL
         END IF
      END IF
*
99999 FORMAT (1X,A,I5,A,I5)
99998 FORMAT (5(1X,F8.4))
99997 FORMAT (1X,/1X,' ** F02WEF returned with IFAIL = ',I5)
      END