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NAG CL Interface
f16fbc (dload)

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1 Purpose

f16fbc broadcasts a scalar into a real vector.

2 Specification

#include <nag.h>
void  f16fbc (Integer n, double alpha, double x[], Integer incx, NagError *fail)
The function may be called by the names: f16fbc, nag_blast_dload or nag_dload.

3 Description

f16fbc performs the operation
x (α,α,,α) T ,  
where x is an n-element real vector and α is a real scalar.

4 References

Basic Linear Algebra Subprograms Technical (BLAST) Forum (2001) Basic Linear Algebra Subprograms Technical (BLAST) Forum Standard University of Tennessee, Knoxville, Tennessee https://www.netlib.org/blas/blast-forum/blas-report.pdf

5 Arguments

1: n Integer Input
On entry: n, the number of elements in x.
Constraint: n0.
2: alpha double Input
On entry: the scalar α.
3: x[dim] double Output
Note: the dimension, dim, of the array x must be at least max(1,1+(n-1)|incx|).
On exit: the scalar α is scattered with a stride of incx in x. 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: incx0.
5: fail NagError * Input/Output
The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
NE_BAD_PARAM
On entry, argument value had an illegal value.
NE_INT
On entry, incx=value.
Constraint: incx0.
On entry, n=value.
Constraint: n0.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.

7 Accuracy

The BLAS standard requires accurate implementations which avoid unnecessary over/underflow (see Section 2.7 of Basic Linear Algebra Subprograms Technical (BLAST) Forum (2001)).

8 Parallelism and Performance

f16fbc is not threaded in any implementation.

9 Further Comments

None.

10 Example

This example initializes four elements of a real vector, x, with increment 2, with the value α=0.3.

10.1 Program Text

Program Text (f16fbce.c)

10.2 Program Data

Program Data (f16fbce.d)

10.3 Program Results

Program Results (f16fbce.r)