org.apache.poi.ss.formula.functions
Class FactDouble
java.lang.Object
org.apache.poi.ss.formula.functions.Fixed1ArgFunction
org.apache.poi.ss.formula.functions.FactDouble
- All Implemented Interfaces:
- FreeRefFunction, Function, Function1Arg
public class FactDouble
- extends Fixed1ArgFunction
- implements FreeRefFunction
Implementation for Excel FACTDOUBLE() function.
Syntax:
FACTDOUBLE (number)
Returns the double factorial of a number.
Number is the value for which to return the double factorial. If number is not an integer, it is truncated.
Remarks
- If number is nonnumeric, FACTDOUBLE returns the #VALUE! error value.
- If number is negative, FACTDOUBLE returns the #NUM! error value.
Use a cache for more speed of previously calculated factorial
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
instance
public static final FreeRefFunction instance
FactDouble
public FactDouble()
evaluate
public ValueEval evaluate(int srcRowIndex,
int srcColumnIndex,
ValueEval numberVE)
- Description copied from interface:
Function1Arg
- see
Function.evaluate(ValueEval[], int, int)
- Specified by:
evaluate in interface Function1Arg
factorial
public static java.math.BigInteger factorial(int n)
evaluate
public ValueEval evaluate(ValueEval[] args,
OperationEvaluationContext ec)
- Specified by:
evaluate in interface FreeRefFunction
- Parameters:
args - the pre-evaluated arguments for this function. args is never null,
nor are any of its elements.ec - primarily used to identify the source cell containing the formula being evaluated.
may also be used to dynamically create reference evals.
- Returns:
- never
null. Possibly an instance of ErrorEval in the case of
a specified Excel error (Exceptions are never thrown to represent Excel errors).