Modern Math Log2

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Log2

Returns the base-2 logarithm of a number.

Syntax

Log2( x )

Notes

• Exact for a power of two.
• 0 gives minus infinity and a negative number gives NaN.
• Overloaded on float64 and on float32: a single-precision argument takes the single-precision path and does not widen.
• BOUNDED accuracy: correct to the platform library's stated ulp bound.

Examples

#import "std/numeric"
using numeric

print Log2( 1024.0 )         '' 10
print Log2( 3.0 )            '' 1.584962500721156
print Log2( 0.0 )            '' -1.#INF

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Library: Math Library
Category: Math Library
Documented under: The libm surface