[Om] Questions about representing units

[Christoph LANGE]

Hi Jonathan,

On Saturday 21 February 2009 14:46:31 Jonathan Stratford wrote:
> >BTW, does your unit converter
> >(http://klein.activemath.org:90/~jonathan/units/converter.php) support
> > such compound units for which no explicit symbol has been defined?
>
> Yes, it can cope with many of these (it can't cope with all of them as the
> algorithm's by no means perfect).
> ...
> 17.3 millimetre per nanosecond sqrd to mile per hour sqrd
> 6 ounce inch per minute sqrd to kilogramme metre per second sqrd

OK, thanks!  The reason for my questions is not that we need a perfect unit
conversion service, but some nice service on the web that we can integrate
with our (inter)active documents for demo purposes.  Then, depending on the
acceptance of that idea, the next requirement would be a better unit
conversion service ;-)

> For some reason, I can't get the online version to load

It worked for me yesterday, but not today.  Anyway: Is there any way to obtain
your source code, or the compiled version?  Not sure what one needs for
running this on Linux (just a .NET environment like Mono?), but I suppose that
klein.activemath.org is a Linux server as well.

> >> 1 hour to second is incalculable.
> ...

I see -- thanks for your explanation!  Anyway, we don't require this
conversion to work at the moment, but it just struck me that such a simple
conversion was reported to be impossible.

> "Something that needs considering in OpenMath, but which has quite
> wide-ranging consequences for our system is whether it is correct for a
> unit name to appear in two different CDs, both to represent the same unit,
> as with second, or a different unit. This affects how the units are stored
> and looked up."

For general OpenMath symbols, this has to be possible, of course, but I see
that it might be something between bad style or illegal for OpenMath symbols
that represent units.

> I have no way of updating the version on klein.activemath.org (I never had
> FTP access, only scp, so I used my uni webspace to copy from). It has just
> occurred to me that I could possibly do it through cygwin, so I will try to
> give it a go later on -- but it seems the server is down currently.

How about WinSCP?  That's a more convenient alternative.

> >Is there any better place for reporting this bug?
> I imagine I'm the only one worth reporting bugs to, as I don't think anyone 
> else is likely to work on it.

Didn't James mention one other person who might possibly continue this
project?  Or, on the other hand, how about releasing your code under an open
source licence and hoping for somebody else to help you?

Thanks again for your help!

Cheers,

Christoph

-- 
Christoph Lange, Jacobs Univ. Bremen, http://kwarc.info/clange, Skype duke4701

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