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Re: [h5md-user] Units Module Question

From: Peter Colberg
Subject: Re: [h5md-user] Units Module Question
Date: Fri, 9 May 2014 17:35:36 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

Hi David,

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.)

> 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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