[Gambas-user] Elusive Gambas3 crashing bug

[Jussi Lahtinen]

I'll send my whole project to you later.

According to documentation this should yield True.
? IsBlank(" \\t")
I got always False...

BTW. I'll check all math functions against wolfram|Alpha,
so sometimes I'm not sure where to put limit of acceptable accuracy.

Jussi




2010/11/12 Benoît Minisini <gambas at ...1...>

> > More from GambasTester project....
> >
> >
> > A.
> >
> > According to documentation these functions are same:
> > Debug Ang(-1, 1)
> > Debug ATan2(-1, 1)
> >
> > 2.35619449019235
> > -0.785398163397448
> >
> > So, Atan2 seems to make errors.
>
> The documentation is not accurate enough. Ang() and ATan2() are the same
> functions, except that their arguments are inverted!
>
> >
> >
> > B.
> >
> > Cos(ACos(0.5)) = 0.5  and Tan(ATan(0.5)) = 0.5 are False!
> > Tan(ATan(0.5)) - 0.5 gives 1E-16, so this is seems to be precision
> problem.
> > Is this OK?
>
> Yes. You often have precision problems with floating numbers.
>
> I have the plan to use the "==" operator to implement a floating point
> comparison that would ignore the unsignificant digits, but I must find the
> good algorithm first.
>
> Regards,
>
> --
> Benoît Minisini
>
>
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