| Line | |
|---|
| 1 | COMPLEX FUNCTION CDOTC(N,CX,INCX,CY,INCY) |
|---|
| 2 | * .. Scalar Arguments .. |
|---|
| 3 | INTEGER INCX,INCY,N |
|---|
| 4 | * .. |
|---|
| 5 | * .. Array Arguments .. |
|---|
| 6 | COMPLEX CX(*),CY(*) |
|---|
| 7 | * .. |
|---|
| 8 | * |
|---|
| 9 | * Purpose |
|---|
| 10 | * ======= |
|---|
| 11 | * |
|---|
| 12 | * forms the dot product of two vectors, conjugating the first |
|---|
| 13 | * vector. |
|---|
| 14 | * |
|---|
| 15 | * Further Details |
|---|
| 16 | * =============== |
|---|
| 17 | * |
|---|
| 18 | * jack dongarra, linpack, 3/11/78. |
|---|
| 19 | * modified 12/3/93, array(1) declarations changed to array(*) |
|---|
| 20 | * |
|---|
| 21 | * .. Local Scalars .. |
|---|
| 22 | COMPLEX CTEMP |
|---|
| 23 | INTEGER I,IX,IY |
|---|
| 24 | * .. |
|---|
| 25 | * .. Intrinsic Functions .. |
|---|
| 26 | INTRINSIC CONJG |
|---|
| 27 | * .. |
|---|
| 28 | CTEMP = (0.0,0.0) |
|---|
| 29 | CDOTC = (0.0,0.0) |
|---|
| 30 | IF (N.LE.0) RETURN |
|---|
| 31 | IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 |
|---|
| 32 | * |
|---|
| 33 | * code for unequal increments or equal increments |
|---|
| 34 | * not equal to 1 |
|---|
| 35 | * |
|---|
| 36 | IX = 1 |
|---|
| 37 | IY = 1 |
|---|
| 38 | IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
|---|
| 39 | IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
|---|
| 40 | DO 10 I = 1,N |
|---|
| 41 | CTEMP = CTEMP + CONJG(CX(IX))*CY(IY) |
|---|
| 42 | IX = IX + INCX |
|---|
| 43 | IY = IY + INCY |
|---|
| 44 | 10 CONTINUE |
|---|
| 45 | CDOTC = CTEMP |
|---|
| 46 | RETURN |
|---|
| 47 | * |
|---|
| 48 | * code for both increments equal to 1 |
|---|
| 49 | * |
|---|
| 50 | 20 DO 30 I = 1,N |
|---|
| 51 | CTEMP = CTEMP + CONJG(CX(I))*CY(I) |
|---|
| 52 | 30 CONTINUE |
|---|
| 53 | CDOTC = CTEMP |
|---|
| 54 | RETURN |
|---|
| 55 | END |
|---|
Note: See
TracBrowser
for help on using the repository browser.
