| java.lang.Object org.apache.lucene.util.SmallFloat
SmallFloat | public class SmallFloat (Code) | | Floating point numbers smaller than 32 bits.
author: yonik version: $Id$ |
Method Summary | |
public static float | byte315ToFloat(byte b) | public static float | byte52ToFloat(byte b) | public static float | byteToFloat(byte b, int numMantissaBits, int zeroExp) Converts an 8 bit float to a 32 bit float. | public static byte | floatToByte(float f, int numMantissaBits, int zeroExp) Converts a 32 bit float to an 8 bit float. | public static byte | floatToByte315(float f) | public static byte | floatToByte52(float f) |
byte315ToFloat | public static float byte315ToFloat(byte b)(Code) | | byteToFloat(b, mantissaBits=3, zeroExponent=15)
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byte52ToFloat | public static float byte52ToFloat(byte b)(Code) | | byteToFloat(b, mantissaBits=5, zeroExponent=2)
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byteToFloat | public static float byteToFloat(byte b, int numMantissaBits, int zeroExp)(Code) | | Converts an 8 bit float to a 32 bit float.
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floatToByte | public static byte floatToByte(float f, int numMantissaBits, int zeroExp)(Code) | | 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.
Parameters: f - the 32 bit float to be converted to an 8 bit float (byte) Parameters: numMantissaBits - the number of mantissa bits to use in the byte, with the remainder to be used in the exponent Parameters: zeroExp - the zero-point in the range of exponent values the 8 bit float representation |
floatToByte315 | public static byte floatToByte315(float f)(Code) | | floatToByte(b, mantissaBits=3, zeroExponent=15)
smallest non-zero value = 5.820766E-10
largest value = 7.5161928E9
epsilon = 0.125
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floatToByte52 | public static byte floatToByte52(float f)(Code) | | floatToByte(b, mantissaBits=5, zeroExponent=2)
smallest nonzero value = 0.033203125
largest value = 1984.0
epsilon = 0.03125
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