Dear Colleagues, I have managed to code this...
But I have a question before pushing the tickket. What I can do nowadays: sage: set_precision(100) sage: x=1. sage: x.parent() Real Field with 100 bits of precision sage: ComplexNumber(1.,2.).parent() Complex Field with 99 bits of precision sage: set_precision() sage: x=1. sage: x.parent() Real Field with 53 bits of precision sage: set_precision(100) sage: x=RealNumber(1.) sage: print x 1.000000000000000000000000000 #okay but: sage: set_precision(100) sage: x=RealNumber(1) sage: print x 1.00000000000000 sage: x.parent() Real Field with 53 bits of precision So, what do you think of that? Is it necessary to modify (the parser) so that: sage: set_precision(100) sage: x=RealNumber(1) returns something in "Real Field with 100 bits of precision"?I recall that the idea was to change the default behavior of the parsed floats.
Doing this is possible but not with a very smart implementation. t. Le 13/09/2015 08:55, Thierry Dumont a écrit :
Le 13/09/2015 01:36, Vincent Delecroix a écrit :It would indeed be cool to have an option to change interactively the precision... preparser.set_precision? or simply set_precision? VincentI can look at this and propose an implementation... Thanks! t.On 12/09/15 19:49, David Roe wrote:One approach would be to change "RealNumber('%s')" % num on line 739 of sage.repl.preparse to "RealNumber('%s',min_prec=1000)" % num. David On Sat, Sep 12, 2015 at 12:24 PM, Thierry Dumont <tdum...@math.univ-lyon1.fr> wrote:I have a program with a lot of floating point constants/variables (this is a translation of a C++ program). Nowadays -by default- all these values live in RealField(53). But, as my problem is a bit ill conditioned, I would like to compute in higher precision, say in RealField(1000). Is there a possibility to change the default behavior of say, x=1.0 x.parent() Real Field with 53 bits of precision so that: x=1.0 x.parent() gives Real Field with 1000 bits of precision ? Yours t. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
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