From: jay.p.belanger@gmail.com
To: help-gnu-emacs@gnu.org
Subject: Re: Getting used to Calc's Radian convention
Date: Fri, 12 Sep 2014 19:26:08 -0700 (PDT) [thread overview]
Message-ID: <26301a71-0d4b-4ac5-bf8a-c1deb3f236bd@googlegroups.com> (raw)
In-Reply-To: <87bnqklkg8.fsf@debian.uxu>
> > Calc's unit convention of revolution per minute (rpm)
>
> > is derived from the angular speed and not from a
>
> > frequency. One does not need to type the factor of `2
>
> > pi' when calculating, for example, the
>
> > circumferential velocity from the radius and some
>
> > value in rpm. So far so good.
>
> >
>
> > But it has the slight aesthetic drawback that now the
>
> > velocity turns out to be in units of radians.
>
> >
>
> > n <- 1 rpm
>
> > r <- 1 m
>
> > n r -> 2 pi rad m / min
> My thoughts are: What?!
He's referring to Calc (part of Emacs), which can work with units (such as meters, radians, etc.)
Calc doesn't "know" that the rad probably shouldn't be there; perhaps there could be a simple way of telling it.
next prev parent reply other threads:[~2014-09-13 2:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.8731.1410504469.1147.help-gnu-emacs@gnu.org>
2014-09-12 19:15 ` Getting used to Calc's Radian convention Emanuel Berg
2014-09-13 2:26 ` jay.p.belanger [this message]
2014-09-13 5:29 ` Emanuel Berg
2014-09-13 7:43 ` H. Dieter Wilhelm
2014-09-13 7:41 ` H. Dieter Wilhelm
2014-09-12 6:47 H. Dieter Wilhelm
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