Re: [Maxima-discuss] Wrong integral

[Evgeniy M. <ema...@e-...>]

And another one:

'integrate(abs(t),t,0,1);
changevar(%,z-t^2,z,t);

07.04.2014 18:18, Evgeniy Maevskiy пишет:
> We can compare this:
>
> --------------
> f:sqrt(sin(x)^4+sin(x)^2*cos(x)^2);
> 'integrate(f,x,0,%pi/2);
> changevar(%,x-atan(t),t,x);
> changevar(%,z-t^2,z,t);
> ev(%,integrate);
> --------------
>
> and this:
>
> --------------
> f:sqrt(sin(x)^4+sin(x)^2*cos(x)^2);
> 'integrate(f,x,0,%pi/2);
> changevar(%,x-atan(t),t,x);
> ev(%,integrate);
> --------------
>
> Best regards,
> Evgeniy
>
>
>
> 07.04.2014 12:05, Jose Carlos Santos пишет:
>> Hi all,
>>
>> If I ask Maxima (5.30) to compute
>>
>>       integrate(sqrt(sin(t)^4+sin(t)^2*cos(t)^2),t,0,%pi/2);
>>
>> then I get -1. This is wrong, of course, since it is the integral of a
>> non-negative function (the correct answer is 1). Why does Maxima behave
>> like this?
>>
>> Best regards,
>>
>> Jose Carlos Santos
>>
>>
>> ------------------------------------------------------------------------------
>> Put Bad Developers to Shame
>> Dominate Development with Jenkins Continuous Integration
>> Continuously Automate Build, Test & Deployment
>> Start a new project now. Try Jenkins in the cloud.
>> http://p.sf.net/sfu/13600_Cloudbees_APR
>> _______________________________________________
>> Maxima-discuss mailing list
>> Max...@li...
>> https://lists.sourceforge.net/lists/listinfo/maxima-discuss
>>
>
>
> ------------------------------------------------------------------------------
> Put Bad Developers to Shame
> Dominate Development with Jenkins Continuous Integration
> Continuously Automate Build, Test & Deployment
> Start a new project now. Try Jenkins in the cloud.
> http://p.sf.net/sfu/13600_Cloudbees_APR
> _______________________________________________
> Maxima-discuss mailing list
> Max...@li...
> https://lists.sourceforge.net/lists/listinfo/maxima-discuss
>