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86 lines
2.4 KiB
Fortran
86 lines
2.4 KiB
Fortran
*DECK ICOPY
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SUBROUTINE ICOPY (N, IX, INCX, IY, INCY)
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C***BEGIN PROLOGUE ICOPY
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C***PURPOSE Copy a vector.
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C***LIBRARY SLATEC (BLAS)
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C***CATEGORY D1A5
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C***TYPE INTEGER (ICOPY-S, DCOPY-D, CCOPY-C, ICOPY-I)
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C***KEYWORDS BLAS, COPY, LINEAR ALGEBRA, VECTOR
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C***AUTHOR Boland, W. Robert, (LANL)
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C Clemens, Reginald, (PLK)
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C***DESCRIPTION
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C
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C B L A S Subprogram
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C Description of Parameters
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C
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C --Input--
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C N number of elements in input vector(s)
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C IX integer vector with N elements
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C INCX storage spacing between elements of IX
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C IY integer vector with N elements
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C INCY storage spacing between elements of IY
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C
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C --Output--
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C IY copy of vector IX (unchanged if N .LE. 0)
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C
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C Copy integer IX to integer IY.
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C For I = 0 to N-1, copy IX(LX+I*INCX) to IY(LY+I*INCY),
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C where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is
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C defined in a similar way using INCY.
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C
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C***REFERENCES C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
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C Krogh, Basic linear algebra subprograms for Fortran
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C usage, Algorithm No. 539, Transactions on Mathematical
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C Software 5, 3 (September 1979), pp. 308-323.
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 930201 DATE WRITTEN
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C***END PROLOGUE ICOPY
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INTEGER IX(*), IY(*)
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C***FIRST EXECUTABLE STATEMENT ICOPY
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IF (N .LE. 0) RETURN
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IF (INCX .EQ. INCY) IF (INCX-1) 5,20,60
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C
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C Code for unequal or nonpositive increments.
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C
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5 IIX = 1
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IIY = 1
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IF (INCX .LT. 0) IIX = (-N+1)*INCX + 1
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IF (INCY .LT. 0) IIY = (-N+1)*INCY + 1
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DO 10 I = 1,N
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IY(IIY) = IX(IIX)
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IIX = IIX + INCX
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IIY = IIY + INCY
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10 CONTINUE
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RETURN
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C
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C Code for both increments equal to 1.
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C
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C Clean-up loop so remaining vector length is a multiple of 7.
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C
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20 M = MOD(N,7)
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IF (M .EQ. 0) GO TO 40
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DO 30 I = 1,M
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IY(I) = IX(I)
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30 CONTINUE
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IF (N .LT. 7) RETURN
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40 MP1 = M + 1
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DO 50 I = MP1,N,7
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IY(I) = IX(I)
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IY(I+1) = IX(I+1)
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IY(I+2) = IX(I+2)
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IY(I+3) = IX(I+3)
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IY(I+4) = IX(I+4)
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IY(I+5) = IX(I+5)
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IY(I+6) = IX(I+6)
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50 CONTINUE
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RETURN
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C
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C Code for equal, positive, non-unit increments.
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C
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60 NS = N*INCX
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DO 70 I = 1,NS,INCX
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IY(I) = IX(I)
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70 CONTINUE
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RETURN
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END
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