#9835: Make desolve more informative when solving BVP
----------------------------+-----------------------------------------------
Reporter: robert.marik | Owner: burcin
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-4.6.1
Component: calculus | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
----------------------------+-----------------------------------------------
Comment(by robert.marik):
Thanks, I will update the patch as time permits.
The equation from sage-support still fails, since Maxima fails to solve
it. Anyway. Sage and Maxima now know that n is integer.
{{{
ma...@um-bc107:/opt/sage-4.5.3-Debian_Lenny_64-x86_64-Linux$ ./sage
--maxima
;;; Loading
#P"/opt/sage-4.5.3-Debian_Lenny_64-x86_64-Linux/local/lib/ecl/defsys
tem.fas"
;;; Loading
#P"/opt/sage-4.5.3-Debian_Lenny_64-x86_64-Linux/local/lib/ecl/cmp.fa s"
;;; Loading
#P"/opt/sage-4.5.3-Debian_Lenny_64-x86_64-Linux/local/lib/ecl/sysfun .lsp"
Maxima 5.20.1 http://maxima.sourceforge.net
using Lisp ECL 10.2.1
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) declare(n,integer);
(%o1) done
(%i2) eq: 'diff(x,t)^2=alpha-beta*abs(x)^n;
dx 2 n
(%o2) (--) = alpha - beta abs(x)
dt
(%i3) load('contrib_ode)$
(%i4) contrib_ode(eq,x,t);
dx 2 n
(%t4) (--) = alpha - beta abs(x)
dt
first order equation not linear in y'
Improper argument to ratcoeff:
0
#0: linear2(expr=x,x=0)(ode2.mac line 75)
#1: ode1_a(phi=-sqrt(alpha-beta*abs(x)^n),y=x,x=t)(ode1_lie.mac line 176)
#2: ode1_lie(phi=-sqrt(alpha-beta*abs(x)^n),y=x,x=t)(ode1_lie.mac line 54)
-- an error. To debug this try: debugmode(true);
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9835#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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