The mathLib.abs() system function returns the absolute value of a number.
mathLib.abs(numericVariable SMALLINT | INT | BIGINT | DECIMAL | SMALLFLOAT | FLOAT in) returns (result SMALLINT | INT | BIGINT | DECIMAL | SMALLFLOAT | FLOAT)
runningBalance, result SMALLFLOAT; runningBalance = -5.00; result = mathLib.abs(runningBalance); // result = 5.0