root / man / man3 / HPL_daxpy.3
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| 1 | 1 | equemene | .TH HPL_daxpy 3 "September 10, 2008" "HPL 2.0" "HPL Library Functions" |
|---|---|---|---|
| 2 | 1 | equemene | .SH NAME |
| 3 | 1 | equemene | HPL_daxpy \- y := y + alpha * x. |
| 4 | 1 | equemene | .SH SYNOPSIS |
| 5 | 1 | equemene | \fB\&#include "hpl.h"\fR |
| 6 | 1 | equemene | |
| 7 | 1 | equemene | \fB\&void\fR |
| 8 | 1 | equemene | \fB\&HPL_daxpy(\fR |
| 9 | 1 | equemene | \fB\&const int\fR |
| 10 | 1 | equemene | \fI\&N\fR, |
| 11 | 1 | equemene | \fB\&const double\fR |
| 12 | 1 | equemene | \fI\&ALPHA\fR, |
| 13 | 1 | equemene | \fB\&const double *\fR |
| 14 | 1 | equemene | \fI\&X\fR, |
| 15 | 1 | equemene | \fB\&const int\fR |
| 16 | 1 | equemene | \fI\&INCX\fR, |
| 17 | 1 | equemene | \fB\&double *\fR |
| 18 | 1 | equemene | \fI\&Y\fR, |
| 19 | 1 | equemene | \fB\&const int\fR |
| 20 | 1 | equemene | \fI\&INCY\fR |
| 21 | 1 | equemene | \fB\&);\fR |
| 22 | 1 | equemene | .SH DESCRIPTION |
| 23 | 1 | equemene | \fB\&HPL_daxpy\fR |
| 24 | 1 | equemene | scales the vector x by alpha and adds it to y. |
| 25 | 1 | equemene | .SH ARGUMENTS |
| 26 | 1 | equemene | .TP 8 |
| 27 | 1 | equemene | N (local input) const int |
| 28 | 1 | equemene | On entry, N specifies the length of the vectors x and y. N |
| 29 | 1 | equemene | must be at least zero. |
| 30 | 1 | equemene | .TP 8 |
| 31 | 1 | equemene | ALPHA (local input) const double |
| 32 | 1 | equemene | On entry, ALPHA specifies the scalar alpha. When ALPHA is |
| 33 | 1 | equemene | supplied as zero, then the entries of the incremented array X |
| 34 | 1 | equemene | need not be set on input. |
| 35 | 1 | equemene | .TP 8 |
| 36 | 1 | equemene | X (local input) const double * |
| 37 | 1 | equemene | On entry, X is an incremented array of dimension at least |
| 38 | 1 | equemene | ( 1 + ( n - 1 ) * abs( INCX ) ) that contains the vector x. |
| 39 | 1 | equemene | .TP 8 |
| 40 | 1 | equemene | INCX (local input) const int |
| 41 | 1 | equemene | On entry, INCX specifies the increment for the elements of X. |
| 42 | 1 | equemene | INCX must not be zero. |
| 43 | 1 | equemene | .TP 8 |
| 44 | 1 | equemene | Y (local input/output) double * |
| 45 | 1 | equemene | On entry, Y is an incremented array of dimension at least |
| 46 | 1 | equemene | ( 1 + ( n - 1 ) * abs( INCY ) ) that contains the vector y. |
| 47 | 1 | equemene | On exit, the entries of the incremented array Y are updated |
| 48 | 1 | equemene | with the scaled entries of the incremented array X. |
| 49 | 1 | equemene | .TP 8 |
| 50 | 1 | equemene | INCY (local input) const int |
| 51 | 1 | equemene | On entry, INCY specifies the increment for the elements of Y. |
| 52 | 1 | equemene | INCY must not be zero. |
| 53 | 1 | equemene | .SH EXAMPLE |
| 54 | 1 | equemene | \fI\&#include "hpl.h"\fR |
| 55 | 1 | equemene | |
| 56 | 1 | equemene | int main(int argc, char *argv[]) |
| 57 | 1 | equemene | .br |
| 58 | 1 | equemene | {
|
| 59 | 1 | equemene | .br |
| 60 | 1 | equemene | double x[3], y[3]; |
| 61 | 1 | equemene | .br |
| 62 | 1 | equemene | x[0] = 1.0; x[1] = 2.0; x[2] = 3.0; |
| 63 | 1 | equemene | .br |
| 64 | 1 | equemene | y[0] = 4.0; y[1] = 5.0; y[2] = 6.0; |
| 65 | 1 | equemene | .br |
| 66 | 1 | equemene | HPL_daxpy( 3, 2.0, x, 1, y, 1 ); |
| 67 | 1 | equemene | .br |
| 68 | 1 | equemene | printf("y=[%f,%f,%f]\en", y[0], y[1], y[2]);
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| 69 | 1 | equemene | .br |
| 70 | 1 | equemene | exit(0); return(0); |
| 71 | 1 | equemene | .br |
| 72 | 1 | equemene | } |
| 73 | 1 | equemene | .SH SEE ALSO |
| 74 | 1 | equemene | .BR HPL_dcopy \ (3), |
| 75 | 1 | equemene | .BR HPL_dscal \ (3), |
| 76 | 1 | equemene | .BR HPL_dswap \ (3). |