From: Jay Belanger <jay.p.belanger@gmail.com>
To: "Roland Winkler" <winkler@gnu.org>
Cc: 10554@debbugs.gnu.org
Subject: bug#10554: 24.0.92; No units specified (dimensionless quantities in Emacs Calc)
Date: Thu, 19 Jan 2012 22:53:04 -0600 [thread overview]
Message-ID: <87d3afdlfz.fsf@gmail.com> (raw)
In-Reply-To: <20248.39483.716850.185512@gargle.gargle.HOWL> (Roland Winkler's message of "Thu, 19 Jan 2012 16:33:31 -0600")
>> I'll also change it so that Calc can offer unit systems and composite
>> units as default units, but that should probably wait until after 24.1
>> comes out.
>
> Agreed. This is nothing urgent.
Good; then this part will be taken care of as soon as 24.1 comes out.
>>From a different perspective, I'd say that "dimensionless" is as
> valid a unit as "kg" or "hbar / c". In that sense I'd say that there
> should be a possibility to pass this unit "dimensionless" as an arg
> to calc-convert-units, similar to any other unit that this function
> should use for its final result.
Currently, if Calc is asked to convert part of a units expression, it
will leave any unrequested units unchanged; for example, if 45 mi/hr is
on the stack and the units conversion is called with new units m, then
only the mi will be changed; 45 mi/hr will be converted to 72420.48 m /
hr. To be consistent, I would think that converting to new units 1, all
of the units in the stack expression would be left alone.
> I'd say that "1" appears to be a natural choice in order to express
> the fact that Calc should obtain a dimensionless number.
I suppose you mean /try/ to obtain a dimensionless number.
Calc could have a command that will convert an expression to a
dimensionless number, if possible, or leave it unchanged, if it cannot
be converted to a dimensionless number. I'm not sure that "u c" should
do such branching, but then I'm not sure this behavior is what you
meant.
Jay
next prev parent reply other threads:[~2012-01-20 4:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-19 5:24 bug#10554: 24.0.92; No units specified (dimensionless quantities in Emacs Calc) Roland Winkler
2012-01-19 21:45 ` Jay Belanger
2012-01-19 22:33 ` Roland Winkler
2012-01-20 4:53 ` Jay Belanger [this message]
2012-01-20 8:34 ` Roland Winkler
2012-01-20 16:48 ` Jay Belanger
2012-01-20 17:55 ` Roland Winkler
2012-01-20 19:10 ` Jay Belanger
2012-01-20 20:30 ` Roland Winkler
2012-01-20 20:54 ` Jay Belanger
2012-01-20 22:10 ` Roland Winkler
2012-01-21 0:00 ` Jay Belanger
2012-01-21 9:24 ` Roland Winkler
2012-01-21 14:45 ` Jay Belanger
2012-01-21 15:12 ` Roland Winkler
2012-01-21 15:28 ` Jay Belanger
2012-01-21 15:42 ` Jay Belanger
2012-01-21 16:03 ` Roland Winkler
2012-01-20 20:36 ` Roland Winkler
2012-01-21 4:21 ` Jay Belanger
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