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Re: Getting used to Calc's Radian convention
From: |
jay . p . belanger |
Subject: |
Re: Getting used to Calc's Radian convention |
Date: |
Fri, 12 Sep 2014 19:26:08 -0700 (PDT) |
User-agent: |
G2/1.0 |
> > 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.