On 4/17/07, Timothy Clemans <[EMAIL PROTECTED]> wrote:
>
> http://www.sagemath.org/hg/sage-main?f=258cf90b118f;file=sage/functions/constants.py
>
> "We can obtain floating point approximations to each of these constants
> by coercing into the real field with given precision. For example, to
> 200 decimal places we have the following: "
That's a mistake in the documentation -- replace "decimal places" by
"binary digits". To get n digits you need just over log_2(10) binary digits.
>
> I have done some tests. R = RealField(200); len(str(R(pi))) "is not around
> 200"
>
>
> {{{
> R = RealField(100)
> print len(str(R(pi)))
> print len(str(R(e)))
> R = RealField(200)
> print len(str(R(pi)))
> print len(str(R(e)))
> R = RealField(300)
> print len(str(R(pi)))
> print len(str(R(e)))
> R = RealField(400)
> print len(str(R(pi)))
> print len(str(R(e)))
> ///
> 30
> 30
> 60
> 60
> 91
> 91
> 121
> 121
> }}}
>
> So now how do I get the decimal expansion of say pi to 200 places?\
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