It's consistent with standard Java library. I guess it does not matter
much, unless you have a really weird distribution of the input values.
D.
On Mon, Jan 25, 2010 at 4:13 PM, Benson Margulies <bimargul...@gmail.com> wrote:
> Why do you think they decided that the best hash function for an int
> was the int?
>
> /**
> * Returns a hashcode for the specified value.
> *
> * @return a hash code value for the specified value.
> */
> public static int hash(int value) {
> return value;
>
> //return value * 0x278DDE6D; // see
> org.apache.mahout.math.jet.random.engine.DRand
>
> /*
> value &= 0x7FFFFFFF; // make it >=0
> int hashCode = 0;
> do hashCode = 31*hashCode + value%10;
> while ((value /= 10) > 0);
>
> return 28629151*hashCode; // spread even further; h*31^5
> */
> }
>
