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java.lang.Objectorg.apfloat.internal.LongElementaryModMath
org.apfloat.internal.LongModMath
public class LongModMath
Modulo arithmetic functions for long
data.
Constructor Summary | |
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LongModMath()
Default constructor. |
Method Summary | |
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long[] |
createWTable(long w,
int n)
Create a table of powers of n:th root of unity. |
long |
getForwardNthRoot(long primitiveRoot,
long n)
Get forward n:th root of unity. |
long |
getInverseNthRoot(long primitiveRoot,
long n)
Get inverse n:th root of unity. |
long |
modDivide(long a,
long b)
Modular division. |
long |
modInverse(long a)
Modular inverse, that is 1 / a . |
long |
modPow(long a,
long n)
Modular power. |
long |
negate(long a)
Modular negation. |
Methods inherited from class org.apfloat.internal.LongElementaryModMath |
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getModulus, modAdd, modMultiply, modSubtract, setModulus |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public LongModMath()
Method Detail |
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public final long[] createWTable(long w, int n)
w
- The n:th root of unity modulo the current modulus.n
- The table length (= transform length).
table[i]=wi mod m
, i = 0, ..., n-1.public long getForwardNthRoot(long primitiveRoot, long n)
w
.Assumes that the modulus is prime.
primitiveRoot
- Primitive root of the modulus.n
- The transform length.
public long getInverseNthRoot(long primitiveRoot, long n)
w-1
.Assumes that the modulus is prime.
primitiveRoot
- Primitive root of the modulus.n
- The transform length.
public final long modInverse(long a)
1 / a
. Assumes that the modulus is prime.
a
- The operand.
a-1 mod m
.public final long modDivide(long a, long b)
a
- The dividend.b
- The divisor.
a*b-1 mod m
.public final long negate(long a)
a
- The argument.
-a mod m
.public final long modPow(long a, long n)
a
- The base.n
- The exponent.
an mod m
.
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