In article <8hl2ucfdv...@mid.individual.net>, Gregory Ewing <greg.ew...@canterbury.ac.nz> wrote:
> Tim Bradshaw wrote: > > In general any function > > which raises its argument to more than one power ... doesn't make > > much sense if its argument has units. > > That's not true. Consider the distance travelled by a > falling object: y(t) = y0 + v0*t + 0.5*a*t**2. Here t has > dimensions of time, and it's being raised to different > powers in different terms. It works because the > coefficents have dimensions too, and all the terms end up > having the same dimensions. This reminds me of back when I was a kid and my dad was trying to teach me basic physics. He kept saying that the acceleration of gravity was 9.8 meters per second squared and I just couldn't wrap my brain around what it meant to square a second. Now that I think about it, I still can't. :-) rg -- http://mail.python.org/mailman/listinfo/python-list