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 <nbr...@sfu.ca> wrote: > 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 parents involved should do the trick: > > sage: QQ.is_exact() > True > sage: RR.is_exact() > False > > 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. So you should walk the construction of a parent and see if there are > any inexact constituents: > > sage: parent(A).construction() > (MatrixFunctor, Real Field with 53 bits of precision) > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/CANnG189YsBhjH%3DU1u9gYD4oYz%3DvBSOpVOkmaRRj5z3jU41gHrA%40mail.gmail.com.
