On Monday, February 15, 2016 at 7:09:19 AM UTC-8, Harald Schilly wrote:
>
> That's your problem, using "range".
>
That's *our* problem too (and probably what set Jeremy on investigating
this: *we're* executing the matrix construction with a "range".
sage: g=lambda i,j: 0 if j==0 else i/j
sage: m
That's your problem, using "range".
On Monday, February 15, 2016 at 4:03:25 PM UTC+1, Jeremy Martin wrote:
>
> for p in range(3,4):
>
>
That produces python integers while srange produces SageMath Integers.
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On 2016-02-15 15:49, Jeremy Martin wrote:
What is going on here? Those -1's are just incorrect.
They are because you are dividing ordinary Python ints instead of Sage
integers. Solution: ZZ(q)/ZZ(p) instead of q/p.
But shouldn't these two pieces of code
produce the same output?
Yes, they sho
Try running this code in either the cell server or the cloud:
f = lambda p,q: matrix(p-1, p-1, lambda i,j: q*(p-1)/p if i==j else -q/p)
for p in range(3,4):
for q in range(2,3):
print f(p,q)
print f(3,2)
This produces the following output:
[4/3 -1]
[ -1 4/3]
[ 4/3 -2/3]
[-2/3 4/3]
