'\" t
.\" Copyright (c) 2026 Bruce Hill
.\" All rights reserved.
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.TH Num.log2 3 2026-08-27 "Tomo man-pages"
.SH NAME
Num.log2 \- base-2 logarithm
.SH LIBRARY
Tomo Standard Library
.SH SYNOPSIS
.nf
.BI Num.log2\ :\ func(x:\ Num\ ->\ Num?)
.fi
.SH DESCRIPTION
The base-2 logarithm of a number.


.SH ARGUMENTS

.TS
allbox;
lb lb lbx
l l l.
Name	Type	Description
x	Num	The number whose logarithm is to be computed. 
.TE
.SH RETURN
The base-2 log of `x`, or `none` if `x` is not positive.

.SH EXAMPLES
.EX
assert (8.).log2()! == 3
assert (1./4.).log2()! == -2
.EE
.SH SEE ALSO
.BR Tomo-Num (3)