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-*DECK DDOT
-      DOUBLE PRECISION FUNCTION DDOT (N, DX, INCX, DY, INCY)
-C***BEGIN PROLOGUE  DDOT
-C***PURPOSE  Compute the inner product of two vectors.
-C***LIBRARY   SLATEC (BLAS)
-C***CATEGORY  D1A4
-C***TYPE      DOUBLE PRECISION (SDOT-S, DDOT-D, CDOTU-C)
-C***KEYWORDS  BLAS, INNER PRODUCT, LINEAR ALGEBRA, VECTOR
-C***AUTHOR  Lawson, C. L., (JPL)
-C           Hanson, R. J., (SNLA)
-C           Kincaid, D. R., (U. of Texas)
-C           Krogh, F. T., (JPL)
-C***DESCRIPTION
-C
-C                B L A S  Subprogram
-C    Description of Parameters
-C
-C     --Input--
-C        N  number of elements in input vector(s)
-C       DX  double precision vector with N elements
-C     INCX  storage spacing between elements of DX
-C       DY  double precision vector with N elements
-C     INCY  storage spacing between elements of DY
-C
-C     --Output--
-C     DDOT  double precision dot product (zero if N .LE. 0)
-C
-C     Returns the dot product of double precision DX and DY.
-C     DDOT = sum for I = 0 to N-1 of  DX(LX+I*INCX) * DY(LY+I*INCY),
-C     where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is
-C     defined in a similar way using INCY.
-C
-C***REFERENCES  C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
-C                 Krogh, Basic linear algebra subprograms for Fortran
-C                 usage, Algorithm No. 539, Transactions on Mathematical
-C                 Software 5, 3 (September 1979), pp. 308-323.
-C***ROUTINES CALLED  (NONE)
-C***REVISION HISTORY  (YYMMDD)
-C   791001  DATE WRITTEN
-C   890831  Modified array declarations.  (WRB)
-C   890831  REVISION DATE from Version 3.2
-C   891214  Prologue converted to Version 4.0 format.  (BAB)
-C   920310  Corrected definition of LX in DESCRIPTION.  (WRB)
-C   920501  Reformatted the REFERENCES section.  (WRB)
-C***END PROLOGUE  DDOT
-      DOUBLE PRECISION DX(*), DY(*)
-C***FIRST EXECUTABLE STATEMENT  DDOT
-      DDOT = 0.0D0
-      DTEMP = 0.0D0
-      IF (N .LE. 0) RETURN
-      IF (INCX .EQ. INCY) IF (INCX-1) 5,20,60
-C
-C     Code for unequal or nonpositive increments.
-C
-    5 IX = 1
-      IY = 1
-      IF (INCX .LT. 0) IX = (-N+1)*INCX + 1
-      IF (INCY .LT. 0) IY = (-N+1)*INCY + 1
-      DO 10 I = 1,N
-        DDOT = DDOT + DX(IX)*DY(IY)
-        IX = IX + INCX
-        IY = IY + INCY
-   10 CONTINUE
-      RETURN
-C
-C     Code for both increments equal to 1.
-C
-C     Clean-up loop so remaining vector length is a multiple of 5.
-C
-   20 M = MOD(N,5)
-      IF (M .EQ. 0) GO TO 40
-      DO 30 I = 1,M
-         DDOT = DDOT + DX(I)*DY(I)
-   30 CONTINUE
-      IF (N .LT. 5) RETURN
-   40 MP1 = M + 1
-      DO  I = MP1,N,5
-      DDOT = DDOT + DX(I)*DY(I) + DX(I+1)*DY(I+1) + DX(I+2)*DY(I+2) +
-     1              DX(I+3)*DY(I+3) + DX(I+4)*DY(I+4)
-      END DO
-      RETURN
-C
-C     Code for equal, positive, non-unit increments.
-C
-   60 NS = N*INCX
-      DO 70 I = 1,NS,INCX
-        DDOT = DDOT + DX(I)*DY(I)
-   70 CONTINUE
-      RETURN
-      END