[R] simple problems
ggrothendieck at gmail.com
Fri Dec 7 00:42:06 CET 2007
On Dec 6, 2007 6:13 PM, Emmanuel Charpentier <charpent at bacbuc.dyndns.org> wrote:
> Gabor Grothendieck a écrit :
> > On Dec 6, 2007 3:26 PM, marciarr <marcia.rocha at gmail.com> wrote:
> [ Snip.... ]
> >> 2- how do I solve a simple equation? Considering the equation y= exp(-x)^12,
> >> I would like to find the values of x for, for example, y=0.01, so
> >> exp(-x)^12=0.01. How do I do that using R?
> >> I know those a probably very, very simple questions, but for which I do not
> >> seem to find the answer.
> > Search between 0 and 1 for the root of the indicated function:
> > uniroot(function(x) 0.1 - exp(-x)^12, 0:1)
> I beg your pardon ?
> I'd rather use high-school algebra/analysis :
> Rushing for a sophisticated numerical tool without thinking for an
> explicit solution is easy, fast, lazy (I do that every day ...), but
> deprives you of the process of understanding the problem.
The posting instructions ask for minimal code and its likely that the
poster did not literally mean that that was the eventual problem.
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