Modern Math Frexp

Home › Math Library › Math Library › Frexp

Frexp

Splits a number into a fraction from 0.5 to 1 and a power of two.

Syntax

Frexp( byval x as float64, byref expo as int32 ) as float64

Notes

• Returns the fraction and writes the exponent through expo, so fraction * 2 ^ expo reconstructs the input exactly.
• The pair to ScaleB, which puts it back together.
• Zero gives a fraction of 0 and an exponent of 0.

Examples

#import "std/numeric"
using numeric

dim as int32 e
dim as float64 f = Frexp( 1024.0, e )

print f                      '' 0.5
print e                      '' 11

'' It round-trips exactly through ScaleB
print ScaleB( f, e )         '' 1024

---

Library: Math Library
Category: Math Library
Documented under: Members