Hello,

I'm looking into NUMBERS-40, which suggests that the exception behavior of 
commons-numbers (specifically the gamma package) needs to be made more 
consistent. Below is a summary of the public exception types explicitly thrown 
by each module.

arrays
        IndexOutOfBoundsException
        IllegalArgumentException

combinatorics
        IllegalArgumentException
        NoSuchElementException
        UnsupportedOperationException

complex
        NumberFormatException
        IllegalArgumentException

complex-streams
        IllegalArgumentException

core
        ArithmeticException
        IllegalArgumentException

fraction
        ArithmeticException
        IllegalArgumentException

gamma
        IllegalArgumentException

primes
        IllegalArgumentException

quaternion
        NumberFormatException
        IllegalArgumentException
        IllegalStateException

rootfinder
        IllegalArgumentException


Nothing in this list strikes me as being inconsistent. The types are all 
standard JDK exception types and seem to be used appropriately, IMO. Is there 
any work that needs to be done on this issue?

Regards,
Matt J


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