I was trying to look at the link between quaternions and twistor space. I
did a little notebook. Not exactly what you are looking at but it might
help.
On Saturday, April 16, 2022 at 10:55:31 AM UTC+1 ny22...@gmail.com wrote:
> I am trying to understand how to use Quaternions within sagemath to
sage-support is one of the best list. English is not my mother language and
sometimes I don't explain myself well but always people here are very kind
and trying to help... It's very important this can long !
Le vendredi 14 septembre 2018 18:00:55 UTC+2, Peter Luschny a écrit :
>
> How can I spe
Thanks. This answer my question and I put the tip
in https://groups.google.com/d/msg/sage-support/NFtI5XqjQWg/sz5WPcFMAgAJ
On Monday, November 19, 2018 at 3:58:50 AM UTC-8, John Cremona wrote:
>
> I recommend importing anything you need from sage.all since the details of
> where everything is mi
I wonder why for me the result is
>>> import_statements(QQ)
# ** Warning **: several names for that object: Q, QQ from
sage.rings.rational_field import Q
On Monday, November 19, 2018 at 4:05:55 AM UTC-8, Dima Pasechnik wrote:
On Mon, Nov 19, 2018 at 11:58 AM John Cremona > wrote:
> >
> > I
On Mon, Nov 19, 2018 at 11:58 AM John Cremona wrote:
>
> I recommend importing anything you need from sage.all since the details of
> where everything is might change in time. This works perfectly well:
>
> $ sage -python # so we use Sage's python not my system-wide one
> Python 2.7.15 (default
I recommend importing anything you need from sage.all since the details of
where everything is might change in time. This works perfectly well:
$ sage -python # so we use Sage's python not my system-wide one
Python 2.7.15 (default, Nov 2 2018, 14:32:42)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] o
Thank you both for the answers. However, I’m still stuck:
Focusing on just translating the first line: R. = QQ[]
In sage,
>>> preparse("R. = QQ[]")"R = QQ['x']; (x,) = R._first_ngens(1)">>>
>>> import_statements(QQ)# ** Warning **: several names for that object: Q,
>>> QQfrom sage.rings.rati
Mon 2018-11-19 09:41:03 UTC+1, Simon King:
>
> If I recall correctly, there is a function that for *many* (not all)
> interactively created objects in Sage tells how they can be constructed,
> but I don't recall the name of that function.
That is sage_input, which can be used as follows:
s
Hi
On 2018-11-19, Kolen Cheung wrote:
> Then I thought I can import it in Python like this:
>
> import sage.rings
> # OK
>
> sage.rings.polynomial.polynomial_ring.PolynomialRing_field
> # AttributeError
Admittedly the following is not an ideal solution, but you can do
>>> from sage import all
On Mar 27, 2008, at 18:04 , Chris Godsil wrote:
>
> Just for reference, two comments on the documentation for quaternions:
>
> If x is an element of L as below, then neither x? nor x?? returns any
> information about methods that apply to x.
Tthe '?' and '??' operators only handle defined method
Just for reference, two comments on the documentation for quaternions:
If x is an element of L as below, then neither x? nor x?? returns any
information about methods that apply to x.
Second, in the documentation on quaternions in the reference manual,
there is no reference that
I could find to
Although Justin's solution certainly works, one might consider adding
a "real_part()" function to the quaternion class. But it would not do
to call the function "real_part" since of course it depends on the
ground field (which in the example is QQ and not RR).
I am CC'ing sage-devel since this m
On Mar 27, 2008, at 12:58 PM, Chris Godsil wrote:
>
> I want to extract the "real part" of a quaternion, i.e., if
>
> L. = QuaternionAlgebra(QQ,-1,-1);
>
> and a is in L, then I want the coefficient of 1 in the expansion of as
> a linear combination of 1, i, j and k.
>
> Is there a way to do thi
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