API changes
BigRational implements now Serializable
The BigRational class implements now the Serializable interface and can be serialized
with the standard Java approach using ObjectInputStream and deserialized using ObjectOutputStream.
BigRational extends now Number
The BigRational class extends now from Number and provides the following standard methods:
int intValue()long longValue()float floatValue()double doubleValue()
Bugfixes
BigRational.toFloat() and BigRational.toDouble() with large nominators/denominators
The methods BigRational.toFloat() and BigRational.toDouble() failed to convert large nominators/denominators
into valid float, respectively double numbers.
For example:
BigRational x = BigRational.valueOf("8.804462619980757911125181749462772084351");
System.out.println("rational : " + x.toRationalString());
System.out.println("float : " + x.toFloat());would print:
rational : 8804462619980757911125181749462772084351/1000000000000000000000000000000000000000
float : NaN
After the fix this example prints:
rational : 8804462619980757911125181749462772084351/1000000000000000000000000000000000000000
float : 8.804462
BigRational.toIntegerRationalString() with small negative numbers
Negative rational numbers smaller than 1 where printed without - sign.
For example:
BigRational v = valueOf(-1, 2);
System.out.println("small negative rational toString(): " + v);
System.out.println("small negative rational toIntegerRationalString(): " + v);would print:
small negative rational toString(): -0.5
small negative rational toIntegerRationalString(): 1/2
After the fix this example prints:
small negative rational toString(): -0.5
small negative rational toIntegerRationalString(): -1/2
BigDecimalMath.root(x, n) faster with large n
The BigDecimalMath.root(BigDecimal, BigDecimal, MathContext) function converged very slowly for larger values of n.
This was due to a bad initial value for the Newton-Raphson approximation.
Now the initial value for the Newton-Raphson approximation is calculated using double precision.
If the initial value cannot be calculated using double precision the function pow(x, 1/n) is used to calculate the root.
Enhancements
No enhancements.
Examples
Note: The example code is available on github, but not part of the big-math library.
No changes in the examples.