En Tue, 02 Oct 2007 01:59:35 -0300, [EMAIL PROTECTED] <[EMAIL PROTECTED]> escribi�:
> How does gmpy make the conversion from float to rational? Well, you know, these days valuable software usually comes with something people call "documentation". Incomprehensible documents in strange formats talking about esoteric stuff that nobody is able to read (as if someone wanted to actually read them!). Hidden in the land of Mordor where the shadows lie, there is an ancient scroll -a long time forgotten by mankind- where you can read terrible things like this: "If an mpf or float argument is passed, the mpq is built from it with an 'optimal' approach based on a Stern-Brocot tree." <http://gmpy.googlecode.com/svn/trunk/doc/gmpydoc.txt> On the motivation for doing such evil things, you can read the explanation given centuries ago by its creator, by then the High Wizard Alessandro: "[The algorithm tries] to convert floats to rationals giving the smallest denominator compatible with the hypothesis that the float is precise to N bits [...] usually DBL_MANT_BITS [...] normally 53 today" <http://mail.python.org/pipermail/python-list/2002-October/166974.html> -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
