From: Mark Thomas <mark@...>
Date: 2008-11-11T01:47:51+09:00
Subject: Re: what's easiest way to compare a Float & BigDecimal (i.e. like a 	equals mechanism)

On Nov 8, 1:26 am, Greg Hauptmann <greg.hauptmann.r...@gmail.com>
wrote:
> Hi,
>
> what's easiest way to compare a Float & BigDecimal (i.e. like a equals
> mechanism)?  It seems that "==" does NOT work as they are different
> types.  Is there a way to do a comparison without having to convert
> types?
>
> ?> a
> => #<BigDecimal:2395e98,'0.65E1',8(8)>>> x
> => 6.5
> >> a == x
>
> => false      #<<== DIDN'T WORK

I thought I saw a similar discussion not too long ago... aha:

http://groups.google.com/group/comp.lang.ruby/msg/bc1e54150d1d45d5

With the approx_equal? method in that thread, this works:

a = BigDecimal.new('6.5')
f = 6.5
f == a
#=> false
f.approx_equal?(a, 0.00000000001)
#=> true


-- Mark.