The Maxima command 'mnewton' has a bug.
The problem may be solved by updating to the most recent build of Maxima.
{{{
sage: mnewton([x1+3*log(x1)-x2^2, 2*x1^2-x1*x2-5*x1+1], [x1, x2], [5, 5])
[[x1=3.756834008012769,x2=2.779849592817897]]sage: mnewton([2*a^a-5],[a],[1]) [[a=1.70927556786144]] sage: mnewton([2*3^u-v/u-5, u+2^v-4], [u, v], [2, 2]); Traceback (most recent call last): ... TypeError: error evaluating "mnewton([2*3^u-v/u-5, u+2^v-4], [u, v], [2, 2]);": Error executing code in Maxima CODE: mnewton([2*3^u-v/u-5, u+2^v-4], [u, v], [2, 2]); Maxima ERROR: Unable to convert 18.0*log(3)+0.5 to a complex double float #0: solve_by_lu(eqs=[h[1]*(18.0*log(3)+0.5)-0.5*h[2]+12.0,4.0*h[2]*log(2)+h[1]+2.0],vars=[h[1],h[2]],field=complexfield) #1: mnewton(funclist=[-v/u+2*3^u-5,2^v+u-4],varlist=[u,v],guesslist=[2,2])(mnewton.mac line 106) sage: build_info()$ Maximaversion:5.13.0Maximabuilddate:18:511/18/2008hosttype:x86_64-unknown-linux-gnulisp-implementation-type:CLISP lisp-implementation-version:2.41(2006-10-13)(built3409699542)(memory3409699897) }}} The build_info() command indicates Sage is using Maxima 5.13. I submitted the problem to Maxima Support and they said it works for Maxima 5.14. http://sourceforge.net/tracker/index.php?func=detail&atid=104933&aid=1909488&group_id=4933 {{{ Date: 2008-03-07 15:21 Sender: willisbl Logged In: YES user_id=895922 Originator: NO It works for me; maybe you have an old version. (%i2) mnewton([2*3^u-v/u-5, u+2^v-4], [u, v], [2, 2]); (%o2) [[u=1.066618389595407,v=1.552564766841786]] (%i8) build_info(); Maxima version: 5.14.0 Maxima build date: 21:46 12/27/2007 host type: i686-pc-mingw32 lisp-implementation-type: GNU Common Lisp (GCL) lisp-implementation-version: GCL 2.6.8 }}} Peace --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
