On Wednesday, 3 May 2023 at 08:58:35 UTC-7 Nils Bruin wrote:
However, be careful:
sage: A=matrix(RR,2,2,[1,2,3,4])
sage: parent(A).is_exact()
True
because matrix rings presently aren't aware of inexactness of their base
rings.
This is something that is considered a bug; see
Thanks Nils.
I shall try to manage with the information you have given me.
(In case you are curious, this is for code aimed at my students.)
Guillermo
On Wed, 3 May 2023 at 17:58, Nils Bruin wrote:
> On Wednesday, 3 May 2023 at 08:21:39 UTC-7 G. M.-S. wrote:
>
>
> Related to a recent
Thanks Nils.
This is now
https://github.com/sagemath/sage/issues/35607
Guillermo
On Wed, 3 May 2023 at 17:51, Nils Bruin wrote:
> On Wednesday, 3 May 2023 at 08:11:25 UTC-7 G. M.-S. wrote:
>
>
> This gives an error:
>
> sage: '' *in* CC
>
> […]
>
>
>
> ^
>
> SyntaxError: invalid syntax
>
>
On Wednesday, 3 May 2023 at 08:21:39 UTC-7 G. M.-S. wrote:
Related to a recent discussion, is there a (simple) way to find whether an
expression contains non exact explicit numbers?
For symbolic expression you should probably walk the entire expression tree.
For sage objects, examining the
On Wednesday, 3 May 2023 at 08:11:25 UTC-7 G. M.-S. wrote:
This gives an error:
sage: '' *in* CC
[…]
^
SyntaxError: invalid syntax
It looks like this error comes from the fact that "eval('')" raises this.
Apparently an empty string is not valid python for the parser. It is a
Related to a recent discussion, is there a (simple) way to find whether an
expression contains non exact explicit numbers?
For example:
M1=matrix(1,2,[1,x+2])
M2=matrix(1,2,[1,x+2.])
mytest(M1)
→ True
mytest(M2)
→ False
Guillermo
--
You received this message because you are subscribed to the
This works:
sage: *for* i *in* [ZZ,QQ,RR]:
: print('empty string in',i,':','' *in* i)
:
empty string in Integer Ring : False
empty string in Rational Field : False
empty string in Real Field with 53 bits of precision : False
This gives an error:
sage: '' *in* CC
[…]
^
