Sha256: 5c8980dda64bba2af6549a435bd5e3d344c109f2099460d19c317e50186cf41b
Contents?: true
Size: 717 Bytes
Versions: 31
Compression:
Stored size: 717 Bytes
Contents
// Returns the natural logarithm of a number.
// @param {Number} $x
// @param {Number} $b The base number
// @example
// log(2) // 0.69315
// log(10) // 2.30259
// log(2, 10) // 0.30103
@use "sass:math";
@function log ($x, $b: null){
@if $b == null{
@return _log($x);
}
@else{
@return math.div(_log($x), _log($b));
}
}
@function _log ($x){
@if $x <= 0{
@return math.div(0, 0);
}
$k: nth(frexp(math.div($x, $SQRT2)), 2);
$x: math.div($x, ldexp(1, $k));
$x: math.div($x - 1, $x + 1);
$x2: $x * $x;
$i: 1;
$s: $x;
$sp: null;
@while $sp != $s{
$x: $x * $x2;
$i: $i + 2;
$sp: $s;
$s: $s + math.div($x, $i);
}
@return $LN2 * $k + 2 * $s;
}
Version data entries
31 entries across 31 versions & 1 rubygems