/**
* Calculates the greatest common divisor of the ratio's dividend and divisor.
*
* @return Decimal
*/
public function greatestCommonDivisor() : Decimal
{
if (null !== $this->gcd) {
return $this->gcd;
}
$cleared = $this->clearDecimals();
$a = $cleared->dividend->toString();
$b = $cleared->divisor->toString();
while (bccomp($b, '0') !== 0) {
list($a, $b) = [$b, bcmod($a, $b)];
}
$gcd = new Decimal($a);
return $this->gcd = $gcd->abs();
}
public function testAbs()
{
$decimal1 = new Decimal("-123.123");
$this->assertEquals("123.123", (string) $decimal1->abs());
}
/**
* Divides this decimal by another.
*
* @param Decimal $other
* @param int $scale
*
* @return Decimal
*/
public function divideBy(Decimal $other, int $scale = null) : Decimal
{
if ($other->isZero()) {
throw new \LogicException('Cannot divide by zero.');
}
if ($other->isOne()) {
return $this;
}
if (null === $scale) {
// Determine a reasonable scale to avoid too much loss of precision.
$abs = $this->abs();
$otherAbs = $other->abs();
$otherLog10 = self::computeLog10($otherAbs->value, $otherAbs->numberOfDecimalPlaces(), 1);
$log10 = self::computeLog10($abs->value, $abs->numberOfDecimalPlaces(), 1) - $otherLog10;
$totalDecimalPlaces = $this->numberOfDecimalPlaces() + $other->numberOfDecimalPlaces();
$maxSignificantDigits = max($this->numberOfSignificantDigits(), $other->numberOfSignificantDigits());
$scale = (int) max($totalDecimalPlaces, $maxSignificantDigits - max(ceil($log10), 0), ceil(-$log10) + 1);
}
$result = bcdiv($this->value, $other->value, $scale);
return static::fromString($result);
}
