Thank you, that's helpful. Is there a way to get all roots of a Python function on an interval?
On Friday, June 20, 2014 2:10:38 AM UTC-7, Dima Pasechnik wrote: > > On 2014-06-20, David Ingerman <davidd...@gmail.com <javascript:>> wrote: > > Thank you, so what to do for Python function? Matlab had general > purpose > > 'optim(f)' if my memory is right... > > you can e.g. use find_root(); this is a numerical thing that accepts > Python functions. Here is an example: > > sage: def f(x): > return x-cos(x) > ....: > sage: find_root(f,0,1) > 0.7390851332151559 > sage: > > > > > On Wednesday, June 11, 2014 1:50:10 AM UTC-7, Dima Pasechnik wrote: > >> > >> On 2014-06-10, David Ingerman <davidd...@gmail.com <javascript:>> > wrote: > >> > > >> > How to solve([f(x)==0],x) for a function "f(x)" defined in a .sage > >> file? > >> > > >> > The error message: TypeError: Cannot evaluate symbolic expression to > a > >> > numeric value. > >> > >> what is f(x) ? > >> solve() won't work for a Python function, it needs a symbolic > >> expression, e.g. > >> > >> sage: type(sin(x)) > >> <type 'sage.symbolic.expression.Expression'> > >> sage: > >> > >> > > >> > Thank you... > >> > > >> > >> > > > > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
