[Maxima] integrate: is this question a bug?
willisb at unk.edu
Wed Jul 18 12:32:25 CDT 2007
Macsyma evaluates integrate(exp( sqrt(x)), x, 1, 5) without
asking any questions.
-----maxima-bounces at math.utexas.edu wrote: -----
>To: Edwin Woollett <woollett at charter.net>
>From: Raymond Toy <raymond.toy at ericsson.com>
>Sent by: maxima-bounces at math.utexas.edu
>Date: 07/18/2007 11:50AM
>cc: maxima mailing list <maxima at math.utexas.edu>
>Subject: Re: [Maxima] integrate: is this question a bug?
>Edwin Woollett wrote:
>> Hi Mailing List,
>> Maxima asks an apparently meaningless question for the following
>> (using v. 12.0 with windows xp)
>> (%i1) myint: integrate( exp( sqrt(x) ), x, 1, 5);
>> Is yx positive or negative?
>> Is yx - 1 positive, negative, or zero?
>> (%o1) 2 (sqrt(5) - 1) %e
>> Are these questions a bug??
>I consider these bugs. For the record, when doing definite integrals,
>maxima is trying a substitution here. It uses the internal variable yx
>and wants to solve the equation yx = exp(sqrt(x)) for x. I guess it
>needs to know the sign of yx to solve this.
>I don't know how to fix this problem.
>Does Macsyma have this problem?
>Maxima mailing list
>Maxima at math.utexas.edu
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