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| 1 | SUBROUTINE ZSCAL(N,ZA,ZX,INCX) |
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| 2 | * .. Scalar Arguments .. |
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| 3 | DOUBLE COMPLEX ZA |
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| 4 | INTEGER INCX,N |
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| 5 | * .. |
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| 6 | * .. Array Arguments .. |
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| 7 | DOUBLE COMPLEX ZX(*) |
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| 8 | * .. |
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| 9 | * |
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| 10 | * Purpose |
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| 11 | * ======= |
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| 12 | * |
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| 13 | * scales a vector by a constant. |
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| 14 | * jack dongarra, 3/11/78. |
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| 15 | * modified 3/93 to return if incx .le. 0. |
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| 16 | * modified 12/3/93, array(1) declarations changed to array(*) |
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| 17 | * |
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| 18 | * |
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| 19 | * .. Local Scalars .. |
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| 20 | INTEGER I,IX |
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| 21 | * .. |
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| 22 | IF (N.LE.0 .OR. INCX.LE.0) RETURN |
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| 23 | IF (INCX.EQ.1) GO TO 20 |
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| 24 | * |
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| 25 | * code for increment not equal to 1 |
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| 26 | * |
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| 27 | IX = 1 |
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| 28 | DO 10 I = 1,N |
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| 29 | ZX(IX) = ZA*ZX(IX) |
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| 30 | IX = IX + INCX |
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| 31 | 10 CONTINUE |
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| 32 | RETURN |
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| 33 | * |
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| 34 | * code for increment equal to 1 |
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| 35 | * |
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| 36 | 20 DO 30 I = 1,N |
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| 37 | ZX(I) = ZA*ZX(I) |
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| 38 | 30 CONTINUE |
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| 39 | RETURN |
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| 40 | END |
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