Re: [Boost-bugs] [Boost C++ Libraries] #4418: units::electron_charge units::current incorrect

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4418: units::electron_charge units::current incorrect
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-07-10 20:25:39

#4418: units::electron_charge units::current incorrect
-------------------------------------------+--------------------------------
  Reporter:  mejames7760.atatatat.att.net  |       Owner:  matthiasschabel     
      Type:  Bugs                          |      Status:  new                 
 Milestone:  Boost 1.44.0                  |   Component:  units               
   Version:  Boost 1.40.0                  |    Severity:  Problem             
Resolution:                                |    Keywords:  units charge current
-------------------------------------------+--------------------------------

Comment (by mejames7760.atatatat.att.net):

 I have a tar file to send you but it exceeds the 256k limits.  I spent the
 day changing units to work the way that I think that it should work.  The
 tgz file as the modified units.tgz plus the test project. Please send me
 an email based my "reported by name" or download from
 "http://www.mj3.biz/church/unitsTestCase.tgz"

 I have to admit that this is confusing. And multiple places have
 conflicting information.  However I think that having base units as
 defined at http://en.wikipedia.org/wiki/SI_base_unit (which has ampere as
 a base unit) and doing dimensional analysis as defined at
 http://en.wikipedia.org/wiki/Dimensional_analysis (which has charge as the
 base dimension)are two different but related things.  And what boost:units
 tries to do is connect them in a way that a computer can understand.

 Your reference above is to base units not base dimensions.

 The problem is the way that dimensions were defined. Current and charge
 are not the same thing.  I was trying to work a charge problem with no
 reference to time.  So I couldn't create Coulomb's Constant with the right
 dimensions.  With the modified boost::units it works perfectly.

 Thanks.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4418#comment:2>
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