Can someone please shed light on this?
The following works OK:
k, n = var ('k n')
sum(k, k, 1, 10) # ok. Gives 55
n = 10
sum(k, k, 1, n) # ok. Gives 55
But this gives an exception:
for n in range(1,10):
sum(k, k, 1, n)
/Users/s/sw/sage/local/lib/python2.6/site-packages/sag
I forgot to add:
This too works OK.
k, n = var('k n')
sum(k, k, 1, n) # gives 1/2*n^2 + 1/2*n
It fails only when n is a loop iterator.
--
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to
sage-support+unsubscr...@googlegroups.com
F
Thanks much for your note.
What surprises me is that sum() doesn't need coercion to sage integers
when working with int-typed variables and numbers:
sum(k, k, 1, 10) # ok
n = 10; sum(k, k, 1, n)# ok
I couldn't figure out the code path that looks for this difference.
How does the sum 'kno
Ah, that solves the mystery. Thanks, Nils.
As kcrisman suggested, functions should be able to automatically
coerce ints to Sage Integers.
--sriram.
--
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to
sage-support+unsubscr...@go
