Le 09/12/2011 08:51, Juan Barandiaran a écrit :
> Hi,
Hi Juan,
>
> In Complex.java the tanh is computed with the following formula:
>
> tanh(a + bi) = sinh(2a)/(cosh(2a)+cos(2b)) + [sin(2b)/(cosh(2a)+cos(2b))]i
>
> The problem that I'm finding is that as soon as "a" is a "big" number,
> both sinh(2a) and cosh(2a) are infinity and then the method tanh returns in
> the real part NaN (infinity/infinity) when it should return 1.0.
>
> Wouldn't it be appropiate to add something as in the FastMath library??:
>
> if (real>20.0){
> return createComplex(1.0, 0.0);
> }
> if (real<-20.0){
> return createComplex(-1.0, 0.0);
> }
Yes, this does make sense. Could you open a Jira issue with this request ?
Thanks,
Luc
>
>
> Best regards,
>
> JBB
>
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