I have now added new category Hashable with intent that domains
declare Hashable if and only if 'hashUpdate!' is properly
implemented. So 'hash' and 'hashUpdate!' are removed from
SetCategory.
AFAICS Hashable rarely can be declered at category level.
Probably it should be declared only if we can
Hi,
>> add
>> hash(s : %): SingleInteger == 0$SingleInteger
this is equivalent to 'hash off'
> have no idea how to choose good hash values. One basically has to find a
> mapping that uniformly distributes all hash values of data structures of
> % over Integer
At least in the C++ lang
Hi Bill,
I looked at sandbox and I find this way promissing for my purpose.
Franz Lehner mentioned to me this behaviour of FriCAS in Hannover, I guess that
in his code he took care exactly to generate a hashable key, but I
have to look that
up again... I am still busy with plethysms, which turne
I was trying to add an example of using Ralf's new CachedFunction domain
http://axiom-wiki.newsynthesis.org/SandBoxCachedFunction
with a function with more than one argument. I was surprised to learn
that 'Table' only uses an efficient hashing method if
'hashable(Key)$Lisp' is true, where 'Key
