[eml-dev] annotating log-transformed units

[Matt Jones]

I think that both the input to and output of the log function are
dimensionless numbers.  So I would use dimensionless in my EML unit. See
these discussions:

http://physics.stackexchange.com/questions/13060/what-is-the-logarithm-of-a-kilometer-is-it-a-dimensionless-number
http://www.sciforums.com/showthread.php?64346-what-s-the-UNIT-after-you-take-the-natural-log

Matt


On Tue, Nov 26, 2013 at 6:34 AM, Carl Boettiger <cboettig at gmail.com> wrote:

> Hi eml-dev,
>
> Any advice on the best way to write the EML attribute metadata for, e.g. a
> column whose units are log-transformed lengths measured in centimeters?
> (Logarithms being 'pure', formally).  (I see definitions for powers but not
> logs among the standardUnits<http://knb.ecoinformatics.org/software/eml/eml-2.1.1/eml-unitTypeDefinitions.html>)
>
>
> Would this require a custom unit definition?  Seems like this might be a
> reasonably common use-case, so curious how others are handling it.
>
> Thanks and sorry for the bother,
>
> - Carl
>
> (referred from reml/issues/57 <https://github.com/ropensci/reml/issues/57>
> )
>
> --
> Carl Boettiger
> UC Santa Cruz
> http://carlboettiger.info/
>
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