[ltp] T22 temperature

[FeRD]

Don Perley wrote:
> FWIW, 92C is about 198 F, and 97C is about 207 F.  Looks like  you 
> forgot the 32 degree offset, +/- some truncation.  That's significant.
Huh, you're absolutely right.

...Which is disturbing, because I knew damn well I couldn't be trusted 
doing that math, so I let units(1) do it all. Turns out I was right, I 
couldn't be trusted doing that math.... with units(1).

[ferd@-------]~% units
2438 units, 71 prefixes, 32 nonlinear units

You have: 92 degC
You want: degF
        * 165.6
        / 0.0060386473
You have: 97 degC
You want: degF
        * 174.6
        / 0.0057273769

Here, FeRD demonstrates that letting units(1) do your math is only 
advisable when you know how to ask it the right questions. (Or are 
paying attention enough to sanity-check things like the fact that 97C 
should be pretty damn close to 212F. Not almost 40 degrees shy.) Looks 
like I should have phrased this:

You have: tempC(92)
You want: tempF
        197.6
You have: tempC(97)
You want: tempF
        206.6

I won't go into what units tries to do with 'degC' and 'degF' that 
allowed me to trick myself into (not-)thinking I had generated the 
proper conversions. The morbidly curious can always type 'help degC' 
into a "You have:" prompt like I did. (If Larry Wall had written the 
units definition file, at least that section would be preceded by a "# 
Here be dragons" comment or similar warning. I want my brain back.)

Oops(TM). "Sorry! My Bad!"
  -FeRD