/**
* This method returns the value as a IDouble. Note: Using this method may result in
* lost of precision.
*
* @access public
* @static
* @param ITrit\Type $x the object to be converted
* @return IDouble\Type the value as a IDouble
*/
public static function toDouble(ITrit\Type $x) : IDouble\Type
{
return IDouble\Type::make($x->unbox());
}
/**
* This method returns the hyperbolic tangent of this object's value.
*
* @access public
* @static
* @param IReal\Type $x the operand
* @return IDouble\Type the result
*/
public static function tanh(IReal\Type $x) : IDouble\Type
{
return IDouble\Type::box(tanh($x->unbox()));
}
/**
* This method tests the "isNegative" method.
*
* @dataProvider data_isNegative
*/
public function test_isNegative(array $provided, array $expected)
{
$p0 = IDouble\Module::isNegative(IDouble\Type::box($provided[0]));
$e0 = $expected[0];
$this->assertInstanceOf('\\Saber\\Data\\IBool\\Type', $p0);
$this->assertSame($e0, $p0->unbox());
}
/**
* This method returns whether the operand is a negative number.
*
* @access public
* @static
* @param IDouble\Type $x the object to be evaluated
* @return IBool\Type whether the operand is a negative
* number
*/
public static function isNegative(IDouble\Type $x) : IBool\Type
{
return IBool\Type::box($x->unbox() < 0.0);
}
/**
* This method tests the "toString" method.
*
* @dataProvider data_toString
*/
public function test_toString(array $provided, array $expected)
{
$p0 = IDouble\Type::box($provided[0])->toString();
$e0 = $expected[0];
$this->assertInstanceOf('\\Saber\\Data\\IString\\Type', $p0);
$this->assertSame($e0, $p0->unbox());
}
/**
* This method returns the sum of all items in the list.
*
* @access public
* @static
* @param ISeq\Type $xs the sequence to be processed
* @return IDouble\Type the result
*/
public static function sum(ISeq\Type $xs) : IDouble\Type
{
return $xs->foldLeft(function (IDouble\Type $c, INumber\Type $x) {
return IDouble\Module::add($c, $x->toDouble());
}, IDouble\Type::zero());
}
