Hi John
I think '?' is not a definition that is helpful to most users -- it is
more like an indication that the string -- the empty string in this case
for example -- has not provided a meaningful indication of what the units
are.
I share the same impression. I was thinking it would be nicer
From the point of view of a physicist/physical oceanographer, I understand
a measured quantity or index is dimensionless if it is obtained from
quantities whose units cancel out, e.g., concentration with units of kg/kg
might be argued to be dimensionless, or reynolds number Re = vL/{\nu} has
units
Thank you for all the responses, it sounds like 'all of the above' is the
preferred response to my suggestions of plausible next steps. I will pursue
all of these.
Eizi's point about having no_unit in udunits is sound; I suggest we request
udunits use
'no_unit'
as a representation of
'?'
