From: SourceForge.net <noreply@so...>  20031027 23:12:00

Bugs item #696818, was opened at 20030303 15:15 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=696818&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 6 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: Taylor internal error (rat problem?) Initial Comment: taylor(asin(sin(x)+e),x,0,2) => Quotient by a polynomial of higher degree taylor(log(sqrt(e*%e^x+1)+e),x,0,2) => Quotient by a polynomial of higher degree Maxima version: 5.9.0 Maxima build date: 19:10 2/9/2003 host type: i686pcmingw32 lispimplementationtype: Kyoto Common Lisp lispimplementationversion: GCL25.0  >Comment By: Stavros Macrakis (macrakis) Date: 20031027 18:11 Message: Logged In: YES user_id=588346 gcd:'algebraic (which calls subres internally) also fails.  Comment By: Stavros Macrakis (macrakis) Date: 20030303 16:51 Message: Logged In: YES user_id=588346 Fateman suggested: > Sometimes changing the GCD algorithm to one without > a bug in it helps. gcd:subres for example. Thanks for the tip. Here are results with the different GCD algorithms. Subres/oldgcd is the default in 5.9.0, though the documentation says the default is Spmod/zgcd. The doc also claims that subres is the "new algorithm", though internally, confusingly, the Subres option calls oldgcd; has the mapping between names and functions changed?  taylor(asin(sin(x)+e),x,0,2),gcd:XXX; EZ OK =ezgcd2 SPMOD OK =zgcd FALSE OK MOD OK =newgcd (MOD option in code, not documented) SUBRES error =oldgcd RED error =oldgcd EEZ "EEZGCD is invalid as a function" SPHEN "SPHGCD is invalid as a function" (SPHEN option in code, not documented)  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=696818&group_id=4933 