Is this a bug?
sage: P. = QQ[[]]
sage: p = 1+O(t)
sage: p(t)
1
sage: p(t^2)
1
My understanding is that p(q) is p composed with q, so the above
output should be 1 + O(t) and 1 + O(t^2) respectively.
--
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this gr
Thanks! This seems to work.
--M
On May 5, 9:20 pm, Mike Hansen wrote:
> On Wed, May 5, 2010 at 2:46 PM, Matt Bainbridge
>
> wrote:
> > Sage knows how to coerce from Frac(ZZ[x]) to Frac(QQ[x]). There is no
> > coercion going the other way, though there should be one, sinc
Hello, I have another quick question regarding coercion:
Sage knows how to coerce from Frac(ZZ[x]) to Frac(QQ[x]). There is no
coercion going the other way, though there should be one, since these
two rings are equivalent. Is there a reasonable way for me to define
my own coercion?
--
To post
Thanks, Mike! This works perfectly.
--M
On May 5, 11:09 am, Mike Hansen wrote:
> Hello,
>
> On Wed, May 5, 2010 at 5:03 AM, Matt Bainbridge
>
> wrote:
> > I wrote a sage program which does a lot of arithmetic in the field of
> > rational functions Frac(Q[x,y,z])
Hi there,
I wrote a sage program which does a lot of arithmetic in the field of
rational functions Frac(Q[x,y,z]). The problem is that sage doesn't
check for common divisors of the numerator and denominator, so after
doing a lot of arithmetic operations, I end up with rational functions
whose num
Its easy enough to code this in sage. This seems to work over any
field:
def ps_inverse(f):
if f.prec() is infinity:
raise ValueError, "series must have finite precision for
reversion"
if f.valuation() != 1:
raise ValueError, "series must have valuation one for
reversion"
Thanks, William!
I guess so far it only works over Q?
--Matt
On Dec 7, 7:43 pm, William Stein wrote:
> 2009/12/7 Matt Bainbridge :
>
> > Hi there,
>
> > Does anyone know if Sage has a function for computing the composition
> > inverse of a power series (not the re
Hi there,
Does anyone know if Sage has a function for computing the composition
inverse of a power series (not the reciprocal)?
--Matt
P.S. Just started using sage and finding it very useful. Thanks for
developing it.
--
To post to this group, send email to sage-support@googlegroups.com
To un
