On 2015-12-21 17:53, Volker Braun wrote:
In any case, if you are serious about binary operations then the next
question is going to be: why is ^ not bitwise xor like for Python ints.
That's actually a different question since it involves the preparser. In
Sage, the ^ operator is calling __pow_
I often use ~ to get the multiplicative inverse of an element:
sage: m = matrix.random(QQ,3,3)
sage: m
[-1 -2 1]
[ 0 2 2]
[ 1 -1 1]
sage: ~m
[ -2/5 -1/10 3/5]
[ -1/5 1/5 -1/5]
[ 1/5 3/10 1/5]
sage: G = SymmetricGroup(4)
sage: g = G.an_element()
sage: g
(1,2,3,4)
sage: ~g
(1,4,3,2)
s
On Mon, Dec 21, 2015 at 8:53 AM, Volker Braun wrote:
> On Monday, December 21, 2015 at 5:43:29 PM UTC+1, John Cremona wrote:
>>
>> Of course it does but no mathematician would ever write that in notation
>> as ~x.
>>
>
> Its still a minor optimization (avoids coercion in 1/x), so I'm not so
> sur
On Monday, December 21, 2015 at 5:43:29 PM UTC+1, John Cremona wrote:
>
> Of course it does but no mathematician would ever write that in notation
> as ~x.
>
Its still a minor optimization (avoids coercion in 1/x), so I'm not so sure
that nobody ever used it.
In any case, if you are serious ab
On 21 December 2015 at 16:40, Volker Braun wrote:
> Just to point out the obvious: In Mathematics, "inverting an integer" means
> 1/x
Of course it does but no mathematician would ever write that in notation as ~x.
>
> Though if you want to work with Python ints nothing is stopping you...
>
> sag
Just to point out the obvious: In Mathematics, "inverting an integer" means
1/x
Though if you want to work with Python ints nothing is stopping you...
sage: ~2r
-3
sage: ~int(2)
-3
sage: ~2
1/2
sage: ~ZZ(2)
1/2
On Monday, December 21, 2015 at 5:22:20 PM UTC+1, Mark Bell wrote:
>
> In Python for
