version 1.6, 2010/12/21 13:51:27
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version 1.7, 2011/07/22 07:38:03
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Line 24
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Line 24
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INTEGER I,IX,IY |
INTEGER I,IX,IY |
* .. |
* .. |
IF (N.LE.0) RETURN |
IF (N.LE.0) RETURN |
IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 |
IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN |
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* |
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* code for both increments equal to 1 |
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DO I = 1,N |
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ZTEMP = ZX(I) |
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ZX(I) = ZY(I) |
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ZY(I) = ZTEMP |
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END DO |
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ELSE |
* |
* |
* code for unequal increments or equal increments not equal |
* code for unequal increments or equal increments not equal |
* to 1 |
* to 1 |
* |
* |
IX = 1 |
IX = 1 |
IY = 1 |
IY = 1 |
IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
DO 10 I = 1,N |
DO I = 1,N |
ZTEMP = ZX(IX) |
ZTEMP = ZX(IX) |
ZX(IX) = ZY(IY) |
ZX(IX) = ZY(IY) |
ZY(IY) = ZTEMP |
ZY(IY) = ZTEMP |
IX = IX + INCX |
IX = IX + INCX |
IY = IY + INCY |
IY = IY + INCY |
10 CONTINUE |
END DO |
RETURN |
END IF |
* |
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* code for both increments equal to 1 |
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20 DO 30 I = 1,N |
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ZTEMP = ZX(I) |
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ZX(I) = ZY(I) |
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ZY(I) = ZTEMP |
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30 CONTINUE |
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RETURN |
RETURN |
END |
END |