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Re: [h5md-user] Units Module Question

From: Pierre de Buyl
Subject: Re: [h5md-user] Units Module Question
Date: Sat, 10 May 2014 08:16:05 +0200
User-agent: Mutt/1.5.21 (2010-09-15)


On Fri, May 09, 2014 at 05:35:36PM -0400, Peter Colberg wrote:
> On Fri, May 09, 2014 at 07:01:51PM +0000, Hart, David Blaine wrote:
> > I have a question on the Units module, specifically, the unit
> > string. The specification says, "The unit string consists of a
> > sequence of unit factors separated by a space. A unit factor is
> > either a number (an integer or a decimal fraction) or a unit symbol
> > optionally followed by a non-zero, signed integer indicating the
> > power to which this factor is raised. Each unit symbol may occur
> > only once. There may also be at most one numeric factor, which must
> > be the first one."
> I believe the last sentence says that there may be at most one leading
> “unit factor that is a number”. (But I did not compose that sentence;
> it would be good if Felix or Pierre could confirm that interpretation.)

The description comes as is from the mosaic data model by Konrad
but I understand it also as "you may start with a number and then come the 


> > This isn't a big deal, since the SI prefixes can usually make it so
> > that the decimal only has to be shifted one or two places in the
> > numeric factor, but I thought I'd mention it.
> Would the sentence be unambiguous if it were reworded as follows?
> “There may be at most one numeric unit factor, which must be the first one.”

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