From: Richard <RichardDummyMailbox58407@...>
Date: 2006-11-28T11:05:09+09:00
Subject: Re: Problem using #{...} in eval

Hi John,

Thank you very much.  Now that you point out I need to escape those
"pound signs",  it makes sense.

That enabled me to do what I *really* wanted to do:  set a variable "n"
to the number of significant digits wanted.  The result (which doesn't
address rounding,  which I'll add):

show(%Q@require 'bigdecimal'
require 'bigdecimal/math'
include BigMath
n=20
BigMath::PI(n).to_s =~ /.(.)(.)(.{\#{n-1}})/
"result = " + "\#{$2}\#{$1}\#{$3}"
@)

Again, many thanks for your expert insight.

Best wishes,
Richard


John W. Long wrote:
> Richard wrote:
> > #3: Can't find the elements of the match
> > show(%Q@require 'bigdecimal'
> > require 'bigdecimal/math'
> > include BigMath
> > BigMath::PI(6).to_s =~ /.(.)(.)(.{5})/
> > "result = " + "#{$2}#{$1}#{$3}"
> > @)
>
>
> You need to escape the # signs with a slash:
>
>    show(%Q@require 'bigdecimal'
>    require 'bigdecimal/math'
>    include BigMath
>    BigMath::PI(6).to_s =~ /.(.)(.)(.{5})/
>    "result = " + "\#{$2}\#{$1}\#{$3}"
>    @)
> 
> --
> John Long
> http://wiseheartdesign.com