NAG Library Routine Document

F06BLF

+− Contents

1 Purpose

9 Example

F06BLF computes the quotient of two real scalars.

FUNCTION F06BLF (

REAL (KIND=nag_wp) F06BLF

REAL (KIND=nag_wp)	A, B
LOGICAL	FAIL

F06BLF returns the value

q

via the function name, where

q = \{\begin{cases} a / b, & if ​ a / b ​ does not overflow, \\ 0, & if ​ a = 0, \\ flmax \times sign (a / b), & if ​ a \neq 0 ​  and ​ a / b ​ would overflow. \end{cases}

Here

flmax

is the large value given by

1 / (X02AMF)

, and

sign (a / 0)

is taken as

sign a

None.

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..