| Line | |
|---|
| 1 | DOUBLE COMPLEX FUNCTION ZDOTC(N,ZX,INCX,ZY,INCY) |
|---|
| 2 | * .. Scalar Arguments .. |
|---|
| 3 | INTEGER INCX,INCY,N |
|---|
| 4 | * .. |
|---|
| 5 | * .. Array Arguments .. |
|---|
| 6 | DOUBLE COMPLEX ZX(*),ZY(*) |
|---|
| 7 | * .. |
|---|
| 8 | * |
|---|
| 9 | * Purpose |
|---|
| 10 | * ======= |
|---|
| 11 | * |
|---|
| 12 | * ZDOTC forms the dot product of a vector. |
|---|
| 13 | * |
|---|
| 14 | * Further Details |
|---|
| 15 | * =============== |
|---|
| 16 | * |
|---|
| 17 | * jack dongarra, 3/11/78. |
|---|
| 18 | * modified 12/3/93, array(1) declarations changed to array(*) |
|---|
| 19 | * |
|---|
| 20 | * .. Local Scalars .. |
|---|
| 21 | DOUBLE COMPLEX ZTEMP |
|---|
| 22 | INTEGER I,IX,IY |
|---|
| 23 | * .. |
|---|
| 24 | * .. Intrinsic Functions .. |
|---|
| 25 | INTRINSIC DCONJG |
|---|
| 26 | * .. |
|---|
| 27 | ZTEMP = (0.0d0,0.0d0) |
|---|
| 28 | ZDOTC = (0.0d0,0.0d0) |
|---|
| 29 | IF (N.LE.0) RETURN |
|---|
| 30 | IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 |
|---|
| 31 | * |
|---|
| 32 | * code for unequal increments or equal increments |
|---|
| 33 | * not equal to 1 |
|---|
| 34 | * |
|---|
| 35 | IX = 1 |
|---|
| 36 | IY = 1 |
|---|
| 37 | IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
|---|
| 38 | IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
|---|
| 39 | DO 10 I = 1,N |
|---|
| 40 | ZTEMP = ZTEMP + DCONJG(ZX(IX))*ZY(IY) |
|---|
| 41 | IX = IX + INCX |
|---|
| 42 | IY = IY + INCY |
|---|
| 43 | 10 CONTINUE |
|---|
| 44 | ZDOTC = ZTEMP |
|---|
| 45 | RETURN |
|---|
| 46 | * |
|---|
| 47 | * code for both increments equal to 1 |
|---|
| 48 | * |
|---|
| 49 | 20 DO 30 I = 1,N |
|---|
| 50 | ZTEMP = ZTEMP + DCONJG(ZX(I))*ZY(I) |
|---|
| 51 | 30 CONTINUE |
|---|
| 52 | ZDOTC = ZTEMP |
|---|
| 53 | RETURN |
|---|
| 54 | END |
|---|
Note: See
TracBrowser
for help on using the repository browser.
