Class Hart_Fast2Mult2
java.lang.Object
de.tilman_neumann.jml.factor.FactorAlgorithm
de.tilman_neumann.jml.factor.hart.Hart_Fast2Mult2
public class Hart_Fast2Mult2 extends FactorAlgorithm
A variant of class Hart_Fast2Mult that is about 10% faster in the long end.
-
Field Summary
Fields inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm
NUM_PRIMES_FOR_31_BIT_TDIV, tdivLimit
-
Constructor Summary
Constructors Constructor Description Hart_Fast2Mult2(boolean doTDivFirst)
Full constructor. -
Method Summary
Modifier and Type Method Description long
findSingleFactor(long N)
Find a factor of long N.java.math.BigInteger
findSingleFactor(java.math.BigInteger N)
Find a single factor of the given N, which is composite and odd.java.lang.String
getName()
static void
main(java.lang.String[] args)
Test.Methods inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm
factor, factor, getDefault, searchFactors
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Constructor Details
-
Hart_Fast2Mult2
public Hart_Fast2Mult2(boolean doTDivFirst)Full constructor.- Parameters:
doTDivFirst
- If true then trial division is done before the Hart loop. This is recommended if arguments N are known to have factors < cbrt(N) frequently. With doTDivFirst=false, this implementation is pretty fast for hard semiprimes. But the smaller possible factors get, it will become slower and slower.
-
-
Method Details
-
getName
public java.lang.String getName()- Specified by:
getName
in classFactorAlgorithm
- Returns:
- The name of the algorithm, possibly including important parameters.
-
findSingleFactor
public java.math.BigInteger findSingleFactor(java.math.BigInteger N)Description copied from class:FactorAlgorithm
Find a single factor of the given N, which is composite and odd.- Specified by:
findSingleFactor
in classFactorAlgorithm
- Parameters:
N
- number to be factored.- Returns:
- factor
-
findSingleFactor
public long findSingleFactor(long N)Find a factor of long N.- Parameters:
N
-- Returns:
- factor of N
-
main
public static void main(java.lang.String[] args)Test.- Parameters:
args
- ignored
-