sorry, i forgot tho send the expression va(t):=if t>-3/2 and t<-1 then
va2(-t) elseif t>-1 and t<0 then va1(-t)
elseif t>0 and t<1 then va1(t) elseif t>1 and t<3/2 then va2(t);
i need to have Vaaux, since vi(t), is only one periode, and i need to
expand my period. So i didi is create anothet function that reples my
vi, to both sides.
thanks for your help
2010/4/11 Richard Fateman <fateman at cs.berkeley.edu>:
> Soares Guerra wrote:
>>
>> hello to all,
>>
>> i Would like to know why maxima doesn't integrate the following function.
>>
>> Thanks for your help
>>
>> a0:2/T*integrate(vi(t),t,-T/2,T/2);
>>
>> vi(t):=VAaux(t)+vb(t);
>>
>> VAaux(t):=if t<-T/2 then VAaux(t+T) elseif t<T/2 then va(t) else
>> VAaux(t-T);
>>
>> vb(t):=1/4*cos(15*%pi*t)-1/8*sin(30*%pi*t);
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>>
>
> Maybe it has to do with computation with ranges of integration, conditional
> expressions,
> and the fact that you have not defined va(t).
>
> It seems to me that your expression simplifies to
> 2/T*integrate(va(t),t,-T/2,T/2)
> +
> 2/T*integrate(vb(t),t,-T/2,T/2).
>
> The second part is easily integrated.
>