NAG Library Routine Document

f06blf  (ddiv)

 Contents

    1  Purpose
    7  Accuracy
    10  Example

1
Purpose

f06blf computes the quotient of two real scalars.

2
Specification

Fortran Interface
Function f06blf ( a, b, fail)
Real (Kind=nag_wp):: f06blf
Real (Kind=nag_wp), Intent (In):: a, b
Logical, Intent (Out):: fail
C Header Interface
#include nagmk26.h
double  f06blf_ ( const double *a, const double *b, logical *fail)

3
Description

f06blf returns the value q via the function name, where
q= a/b, if ​a/b​ does not overflow, 0, if ​a=0, flmax×signa/b, if ​a0​ and ​a/b​ would overflow.  
Here flmax is the large value given by 1/x02amf, and signa/0 is taken as signa.

4
References

None.

5
Arguments

1:     a – Real (Kind=nag_wp)Input
On entry: the value a.
2:     b – Real (Kind=nag_wp)Input
On entry: the value b.
3:     fail – LogicalOutput
On exit: .TRUE. if a/b would overflow (in which case q=flmax) or a=b=0 (in which case q=0); otherwise .FALSE..

6
Error Indicators and Warnings

None.

7
Accuracy

Not applicable.

8
Parallelism and Performance

f06blf is not threaded in any implementation.

9
Further Comments

None.

10
Example

None.
© The Numerical Algorithms Group Ltd, Oxford, UK. 2017