Modern Math Log10

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Log10

Returns the base-10 logarithm of a number.

Syntax

Log10( x )

Notes

• Exact for a power of ten, which log( x ) / log( 10 ) is not always.
• 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 Log10( 1000.0 )        '' 3
print Log10( 2.0 )           '' 0.3010299956639812
print Log10( 0.001 )         '' -3

'' The ratio of natural logs is not exactly 3
print log( 1000.0 ) / log( 10.0 ) = 3.0   '' 0 (false)

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