On Wednesday, October 29, 2014 3:38:47 AM UTC-7, Christophe Bal wrote: > > Hello. > > I'm writing a french book about SageMathCloud and I'm looking for known > wrong results given by Sage or Sympy due to floats calculations, or due to > the formal method used. Do you know such things ? My idea is to show to new > user that a CAS or a numerical tool is not Math God. >
Numerical calculation via SageMathCloud is certainly the wrong place to look. As Gupta points out, numerical error happens rather independent of that. How would you react if I said... I'm writing an English book about French mille-feuille pastries and would like to know about food poisoning. My idea is to show that you can die from desserts. In reality, I think you should have some very simple examples that distinguish between exact computation and (unstable) numerical calculation. The classic one is Wilkinson's polynomial and rootfinding. > > I've already posted this question on the Sage list without a lot of > success. > > Christophe BAL > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/c7190e1f-9677-4008-a949-30185b8b30e4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
