PDQ Algorithm: Infinite precision best fraction within tolerance

[Han]

(02-16-2014 02:01 PM)Thomas_Sch Wrote:  

(12-13-2013 05:09 AM)Joe Horn Wrote:  ...PDQ is a CAS program and must be created as such. ...

@Joe: Maybe it could be helpful to add some more words about entering a CAS program, since I didn't find hints about creating a CAS program in the manual(s).
My way (awkward?): First in CAS mode I created an empty program like

Code:

d2f:=(x)->x

then I could edit this by [Shift]+1 (Program), and enter your code. Works fine, besides a small typo ('END;;').

Are there other steps to create/enter a CAS program? Where did you find the operators like '/=' and '+=' ? The manuals are unhelpful ;-)

Many thanks for your programs!
Thomas

The CAS is xcas/giac. You can find relevant documentation here: http://www-fourier.ujf-grenoble.fr/~parisse/giac.html

As for creating CAS programs, your technique is essentially the only method on this current firmware.