NAG FL Interface
f06gdf (zscal)

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1 Purpose

f06gdf scales a complex vector by a complex scalar.

2 Specification

Fortran Interface
Subroutine f06gdf ( n, alpha, x, incx)
Integer, Intent (In) :: n, incx
Complex (Kind=nag_wp), Intent (In) :: alpha
Complex (Kind=nag_wp), Intent (Inout) :: x(*)
C Header Interface
#include <nag.h>
void  f06gdf_ (const Integer *n, const Complex *alpha, Complex x[], const Integer *incx)
The routine may be called by the names f06gdf, nagf_blas_zscal or its BLAS name zscal.

3 Description

f06gdf performs the operation
where x is an n-element complex vector scattered with stride incx, and α is a complex scalar.

4 References

Lawson C L, Hanson R J, Kincaid D R and Krogh F T (1979) Basic linear algebra supbrograms for Fortran usage ACM Trans. Math. Software 5 308–325

5 Arguments

1: n Integer Input
On entry: n, the number of elements in x.
2: alpha Complex (Kind=nag_wp) Input
On entry: the scalar α.
3: x(*) Complex (Kind=nag_wp) array Input/Output
Note: the dimension of the array x must be at least max(1, 1+(n-1) ×incx ) .
On entry: the n-element vector x. xi must be stored in x(1+(i-1)×incx), for i=1,2,,n.
Intermediate elements of x are not referenced.
On exit: the vector αx stored in the array elements used to supply the original vector x(y).
Intermediate elements of x are unchanged.
4: incx Integer Input
On entry: the increment in the subscripts of x between successive elements of x.
Constraint: incx>0.

6 Error Indicators and Warnings


7 Accuracy

Not applicable.

8 Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.
f06gdf is not threaded in any implementation.

9 Further Comments


10 Example