Sha256: 5b343b77c03e79623edb411bdd625d93397473bc5289bacb0b102603fa029de8
Contents?: true
Size: 708 Bytes
Versions: 102
Compression:
Stored size: 708 Bytes
Contents
// Returns the natural logarithm of a number.
// @param {Number} $x
// @param {Number} $b The base number
// @example
// log(2) // 0.69315
// log(10) // 2.30259
// log(2, 10) // 0.30103
@function log ($x, $b: null) {
@if $b == null {
@return _log($x);
} @else {
@return _log($x) / _log($b);
}
}
@function _log ($x) {
@if $x <= 0 {
@return 0 / 0;
}
$k: nth(frexp($x / $SQRT2), 2);
$x: $x / ldexp(1, $k);
$x: ($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 + $x / $i;
}
@return $LN2 * $k + 2 * $s;
}
Version data entries
102 entries across 102 versions & 2 rubygems