Can't you just do something like
(1/ (trate.to_f)).to_s
I expect you don't need all the parantheses1

2009/4/30 James Byrne <[email protected]>

>
> I need to transform a decimal fraction received as a string into its
> reciprocal, also stored as a string.  I have come up with this but I
> would like to know if there exists a better way to accomplish this
> requirement.
>
>      trate = xchg.xpath('cb:value').text
>      scale = 10 ** (trate.length() -1 - (trate.index('.').to_i))
>      value = trate.gsub(/\.|,| /,'').to_i
>      trate = (1000000 * scale / value).to_s
>      trate = trate.rjust(7,'0')
>      trate = trate.insert(-7,'.')
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

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