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