Hello,
I've noticed the following change in simplifications between Sage 6.3 and
preceeding versions:
In Sage 6.2 (and preceeding):
sage: simplify( abs(sqrt(x)) )
sqrt(x)
sage: simplify( abs(1/sqrt(x)) )
1/sqrt(x)
while in Sage 6.3:
sage: simplify( abs(sqrt(x)) )
sqrt(x)
sage:
Hi,
Le mardi 16 septembre 2014 09:30:23 UTC+2, Peter Bruin a écrit :
This is probably due to Maxima. The following happens with and without
the domain: complex setting:
Maxima 5.34.0 http://maxima.sourceforge.net
using Lisp ECL 12.12.1
Distributed under the GNU Public License. See
PS: in the above code, I've simply cut and paste lines from
Expression._maxima_(). In the present case, the super is not necessary and
the code can be simplified to
In Sage 6.2:
sage: from sage.calculus.calculus import maxima
sage: abs(1/sqrt(x))._interface_(maxima)
1/sqrt(x)
while in Sage
PS2 : so Karl-Dieter Crisman was right: the change in behavior is due to
the introduction of unique names for Sage variables in the interface.
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Hello,
PS: in the above code, I've simply cut and paste lines from
Expression._maxima_(). In the present case, the super is not necessary
and the code can be simplified to
In Sage 6.2:
sage: from sage.calculus.calculus import maxima
sage: abs(1/sqrt(x))._interface_(maxima)
1/sqrt(x)
PS: the following message from the Maxima mailing list (found via a
different sqrt-related report in the Maxima bug tracker) is quite
useful:
https://www.ma.utexas.edu/pipermail/maxima/2011/025213.html
From that page:
* abs is a mathematical function which has simplification rules. It
assumes
Thanks for the link! This is quite instructive.
Eric.
Le mardi 16 septembre 2014 11:41:42 UTC+2, Peter Bruin a écrit :
PS: the following message from the Maxima mailing list (found via a
different sqrt-related report in the Maxima bug tracker) is quite
useful:
Thanks for the link! This is quite instructive.
Indeed. Perhaps we should point this out in our documentation for `abs`.
Le mardi 16 septembre 2014 11:41:42 UTC+2, Peter Bruin a écrit :
PS: the following message from the Maxima mailing list (found via a
different sqrt-related
On Monday, September 15, 2014 3:24:42 PM UTC-4, Eric Gourgoulhon wrote:
Hi,
I've noticed the following change in simplifications between Sage 6.3 and
preceeding versions:
In Sage 6.2 (and preceeding):
sage: simplify( abs(sqrt(x)) )
sqrt(x)
sage: simplify( abs(1/sqrt(x)) )
1/sqrt(x)
