On Mon, Jan 21, 2019 at 2:07 PM Thrash <t.ang...@gmx.net> wrote: > > Thank you very much! > > "Not yet reported upstream" > What does that mean?
The bug is in Maxima, not in Sage itself. Sage components such as Maxima are generally called "upstream". > > Am Freitag, 18. Januar 2019 16:06:31 UTC+1 schrieb Emmanuel Charpentier: >> >> This is now Trac#27076. Not yet reported upstream (I have to finde a way to >> recover access toi the damn sourceforge site...). >> >> As far as I can tell, this bug is distinct from all bugs reported against >> desolve ; a cursoly look at othe "symbolics" tickets did not raise this >> exact error, but I may have been mistaken : pleas feel free to correct me... >> >> Thanks to Thrash for taking the time to formally report the bug. >> >> HTH, >> >> Le mercredi 16 janvier 2019 19:05:59 UTC+1, Thrash a écrit : >>> >>> As advised in the thread >>> >>> https://ask.sagemath.org/question/45046/wrong-solutionoutput-for-differential-equation/ >>> >>> I'm opening this one now. >>> >>> >>> When running the following code, one obtains a wrong output: >>> >>> y=function('y')(x) >>> desolve(diff(y)==4*y/x+x*sqrt(y),y,ics=[1,1]).factor() >>> >>> The output is >>> 1/4*x^4*(log(x) - 2)^2 >>> instead of >>> 1/4*x^4*(log(x) + 2)^2 >>> . Mathematica however outputs both (by running >>> DSolve[{D[y[x], x] == 4*y[x]/x + x*Sqrt[y[x]], y[1] == 1}, y[x], x] >>> ). >>> >>> >>> Giac also gives the right answer: >>> sage: giac("desolve([y'=4*y/x+x*sqrt(y),y(1)=1],y)").sage() >>> [1/4*(ln(x) + 2)^2*e^(4*ln(x))] >>> . > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
