From: Frew Schmidt <frioux@...>
Date: 2007-06-16T10:31:59+09:00
Subject: Re: Facets Units. How do I use it?

> The exchange rates are not actually the reason for the slow start-up
> (the exchanged rates are looked up lazily). Tackling the slow start-up
> time is planned for the next version of Units, but at the moment I
> still don't have enough time (I may find some in a month or so).
> 
> As for date calculations, currently Units only has a notion of
> duration, and it seems only up to days. The current version doesn't
> define interaction with actual dates, like adding a month to a today's
> date and such. You might want to look at Active Support for the
> moment.
> 
> Peter

Thanks for the tips!  I'll look into it for sure.  I think that the 
stuff I am doing is simple enough that I can do it by hand (you know, 
minute = 60, hour = 60 * minute, use jurian dates, etc.)  I don't know 
if something in my setup is broken or something, but the vast majority 
of the examples in the Doc didn't work at all.  Here's what happened:

>>   1.bit/s + 8.bytes/s
NameError: undefined local variable or method `s' for main:Object
        from (irb):2
>>   (1.bit/s).to(byte/s)
NameError: undefined local variable or method `s' for main:Object
        from (irb):3
>>   1.mile.to(feet)
NameError: undefined local variable or method `feet' for main:Object
        from (irb):4
>>   1.acre.to(yd**2)
NameError: undefined local variable or method `yd' for main:Object
        from (irb):5
>>   1.acre.to(sq_yd)
NameError: undefined local variable or method `sq_yd' for main:Object
        from (irb):6
>>   1.gallon.to(self.L)
NoMethodError: undefined method `L' for main:Object
        from (irb):7
>>   1.lb.to(kg)
NameError: undefined local variable or method `kg' for main:Object
        from (irb):8
>>   1.m.s.to(m.s)
NameError: undefined local variable or method `m' for main:Object
        from (irb):9
>>   1.sq_mi.to(km**2)
NameError: undefined local variable or method `km' for main:Object
        from (irb):10
>>   1.mile.to(km)
NameError: undefined local variable or method `km' for main:Object
        from (irb):11
>>   1.usd.to(twd)
NameError: undefined local variable or method `twd' for main:Object
        from (irb):12



If I did like, 1.bit + 1.byte it would work, but the examples above all 
failed apparently.

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