Re: multivar for loop variables

On 2026-04-29 20:31, Bill Allombert wrote:
> I have commited an experimental change (39f42a6ce5)
> That allow to use multivar for loop variables as well:
> 
> for example, instead of writing
> 
> foreach(factor(5!)~,pe,my([p,e]=pe);print(p,"^",e))
> 
> one can now write
> 
thank you, I really like that.

I built the current git, and it directly works as advertized with my 
RSA_numbers_factored pari library I created 3 years ago:

hermann@8840hs:~/pari$ ./gp -q 
~/RSA_numbers_factored/pari/RSA_numbers_factored.gp
? foreach(RSA.factored(mod4=[1,1]),[l,n,p,q],print1(l" "))
59 129 180 230 768
? foreach(RSA.factored(mod4=3),[,n],print1(#digits(n)" "))
79 100 110 120 140 150 170 174 200 210 212 232 240
?

".factored(...)" returns 4-tuples, and your new feature seems to deal 
correctly when less than 4 of the components are requested.

> The drawback is that this is not supported by GP2C and this might be
> difficult to
> implement correctly in all case, given the various way iterators are 
> implemented
> in GP2C.
> 
I see that it may be a problem, but since I seldom use GP2C I could live 
with that.

In case I would use the new feature and the need arises to use GP2C, I 
would just create copy with the workaround you mentioned and compile 
that.

Regards,

Hermann.