Status: Valid
Owner: ----
Labels: Type-Enhancement Priority-Low
New issue 4019 by [email protected]: divisors could use a 'pairs' flag
http://code.google.com/p/sympy/issues/detail?id=4019
Something that might be convenient with divisors is to give it a flag that
indicates that the divisors should be given in pairs:
d=divisors(4);p=[(d[i],d[len(d)-i-1]) for i in range(len(d)//2 +
(len(d)%2 == 1))]
p
[(1,4),(2,2)]
d=divisors(120);p=[(d[i],d[len(d)-i-1]) for i in range(len(d)//2 +
(len(d)%2 == 1))]
p
[(1,120),(2,60),(3,40),(4,30),(5,24),(6,20),(8,15),(10,12)]
I guess p could also be computed as [(d[i], n//d[i]) for i in
range(len(d)//2+(len(d)%2 == 1))], e.g.
d
[1,2,3,4,5,6,8,10,12,15,20,24,30,40,60,120]
n=120
[(d[i], n//d[i]) for i in range(len(d)//2+(len(d)%2 == 1))]
[(1,120),(2,60),(3,40),(4,30),(5,24),(6,20),(8,15),(10,12)]
n=4;d=divisors(4)
[(d[i], n//d[i]) for i in range(len(d)//2+(len(d)%2 == 1))]
[(1,4),(2,2)]
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