On 2016-08-19, Montgomery-Smith, Stephen <[email protected]> wrote:
> sage: integrate(y*e^(-y),y,0,t) > > Huge amount of error messages deleted, followed by: > > ValueError: Computation failed since Maxima requested additional > constraints; using the 'assume' command before evaluation *may* help > (example of legal syntax is 'assume(t>0)', see `assume?` for more details) > Is t positive, negative or zero? > However the integral is an analytic function, and exists even if t is > negative or complex. On looking into the source code, I see Maxima is trying to classify the type of problem, and using asksign for that. Maxima can actually get the result without resorting to asksign, but it doesn't try that first. The relevant function, if anybody cares, is METHOD-BY-LIMITS in src/defint.lisp. I dunno if this is a bug. It is needlessly clumsy but not incorrect. HTH in some way. Robert Dodier -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
