Oh, sorry.
chop=<bool>
Replace tiny real or imaginary parts in subresults
by exact zeros (default=False)
No idea how I missed it. Instead, I was trying to make n/precision lower
and round it.
Thanks for your help again.
понедельник, 4 ноября 2013 г., 7:59:59 UTC+4 пользователь Aaron Meurer
написал:
>
> When evalf gives such a small number, it is zero. The precision of
> evalf by default is 15 digits, so 10**-140 and 0 are no different at
> that precision.
>
> You can make evalf automatically reduce such small numbers by passing
> chop=True, like log(x, 2).evalf(subs={x: 1}, chop=True).
>
> Aaron Meurer
>
>
> On Sun, Nov 3, 2013 at 2:04 PM, Alexander Birukov
> <[email protected]<javascript:>>
> wrote:
> > I dont really understand why it happens, although solve(log(x, 2)) gives
> 1
> > as an answer. I'd use solve for sure, but unfortunetly, I have to
> calculate
> > expression with different x.
> > Any solution to fix this?
> >
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