org.apache.lucene.util
Class SmallFloat
Floating point numbers smaller than 32 bits.
static float | byte315ToFloat(byte b) - byteToFloat(b, mantissaBits=3, zeroExponent=15)
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static float | byte52ToFloat(byte b) - byteToFloat(b, mantissaBits=5, zeroExponent=2)
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static float | byteToFloat(byte b, int numMantissaBits, int zeroExp) - Converts an 8 bit float to a 32 bit float.
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static byte | floatToByte(float f, int numMantissaBits, int zeroExp) - Converts a 32 bit float to an 8 bit float.
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static byte | floatToByte315(float f) - floatToByte(b, mantissaBits=3, zeroExponent=15)
smallest non-zero value = 5.820766E-10
largest value = 7.5161928E9
epsilon = 0.125
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static byte | floatToByte52(float f) - floatToByte(b, mantissaBits=5, zeroExponent=2)
smallest nonzero value = 0.033203125
largest value = 1984.0
epsilon = 0.03125
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byte315ToFloat
public static float byte315ToFloat(byte b)
byteToFloat(b, mantissaBits=3, zeroExponent=15)
byte52ToFloat
public static float byte52ToFloat(byte b)
byteToFloat(b, mantissaBits=5, zeroExponent=2)
byteToFloat
public static float byteToFloat(byte b,
int numMantissaBits,
int zeroExp)
Converts an 8 bit float to a 32 bit float.
floatToByte
public static byte floatToByte(float f,
int numMantissaBits,
int zeroExp)
Converts a 32 bit float to an 8 bit float.
Values less than zero are all mapped to zero.
Values are truncated (rounded down) to the nearest 8 bit value.
Values between zero and the smallest representable value
are rounded up.
f
- the 32 bit float to be converted to an 8 bit float (byte)numMantissaBits
- the number of mantissa bits to use in the byte, with the remainder to be used in the exponentzeroExp
- the zero-point in the range of exponent values
- the 8 bit float representation
floatToByte315
public static byte floatToByte315(float f)
floatToByte(b, mantissaBits=3, zeroExponent=15)
smallest non-zero value = 5.820766E-10
largest value = 7.5161928E9
epsilon = 0.125
floatToByte52
public static byte floatToByte52(float f)
floatToByte(b, mantissaBits=5, zeroExponent=2)
smallest nonzero value = 0.033203125
largest value = 1984.0
epsilon = 0.03125
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