Returns the absolute value of its operand.
Returns the arctangent of y/x in the range -pi to pi.
Returns the cosine of expr (expressed in radians).
Returns e to the power of expr.
Returns the integer portion of expr.
Returns natural logarithm (base e) of expr.
Returns a random fractional number between 0 and the value of expr. If expr is omitted, returns a value between 0 and 1.
Returns the sine of expr (expressed in radians).
Returns the square root of expr.
Sets the random number seed for the rand operator.
Returns the number of seconds since January 1, 1970. Suitable for feeding to gmtime and localtime.