Macsyma evaluates integrate(exp( sqrt(x)), x, 1, 5) without
asking any questions.
Barton
-----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
>definite integral:
>>
>> (using v. 12.0 with windows xp)
>>
>> (%i1) myint: integrate( exp( sqrt(x) ), x, 1, 5);
>>
>> Is yx positive or negative?
>>
>> p;
>> Is yx - 1 positive, negative, or zero?
>>
>> p;
>> sqrt(5)
>> (%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?
>
>Ray
>_______________________________________________
>Maxima mailing list
>Maxima at math.utexas.edu
>http://www.math.utexas.edu/mailman/listinfo/maxima