On Tue, 20 Apr 2010 12:03:29 -0400, David Frascone wrote:
> I'm trying to make a running log, but I can't seem to get times entered in
> HH:MM:SS to work right.
> Well -- they work right, but I can't get things to re-display in that
> format. And, sometimes math is just screwy.
> For example:
>> Distance | Time | Time | Speed | Speed |
>> (Miles) | HH:MM:SS | Decimal | (MPH) | (Min/Mile) |
>> ----------+----------+---------+-------+------------|
>> 2.0 | 12:34 | 3:17 | | |
>> 3 | 30:45 | | | |
> #+TBLFM: $3=$2/2
> As you can see the 3:17 is some very strange calculation. Not sure what it
> did. If I use "=$2", it returns 6:17
> It seemed like it was doing something wright, but, now it looks like maybe it
> just doesn't understand HH:MM:SS format?
> What would be the easiest way to implement something like that table? Lisp
> functions?
Calc uses `:' as a "fraction bar" to represent fractional
numbers. So as a result,
12 6
---- = ----
34 17
I'm not sure what is the correct way to do it. But I use a
cheap hack -- abuse the degree notation. Calc understands
arc degrees as a form of 1...@34'00, that is
DEGREE @ MIN ' SEC
I use DEGREE field as hours, thus normal arithmetic works
out of the box.
Hope it helps.
--
J c/* __o/*
X <\ * (__
Y */\ <
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