Re: Time calculation: vsum?

[Christian Moe <mail@christianmoe.com>]

Hi, Michael,

First, I just realized I was part wrong: vsum of time values DOES work 
(sorry, Eric!).


| Task 1 | Task 2 | Task 3 |   Total |
|--------+--------+--------+---------|
|  35:00 |  35:00 |   4:00 | 1:14:00 |
#+TBLFM: @2$4=vsum($1..$3);T


| Task   |  Time |
|--------+-------|
| Task 1 | 35:00 |
| Task 2 | 35:00 |
| Task 3 |  4:00 |
|--------+-------|
| Total  |  1:14 |
#+TBLFM: @5$2=vsum(@I..@II);T


But in the vertical vsum in the second example above, the right answer 
is misleadingly formatted, so you'd read it as 1 min 14 seconds, not 1 
hr 14 mins.

And I'm still failing to get the right vsum /vertically/ with times 
one hour or above, e.g.:

| Task   |    Time |
|--------+---------|
| Task 1 | 1:35:00 |
| Task 2 | 1:35:00 |
| Task 3 | 1:04:00 |
|--------+---------|
| Total  |       3 |
#+TBLFM: @5$2=vsum(@I..@II);T


Meanwhile, Michael, thanks for your elisp solution -- it's more 
compact than mine, and I'll be happy to steal it!

But support for time calculations -- in calc formulas too -- has been 
added in 7.6.

Yours,
Christian

On 7/17/11 2:27 PM, Michael Markert wrote:
> Hi Christian,
>
> On 17 Jul 2011, Christian Moe wrote:
>> Hi,
>>
>> Time calculations don't seem to work with vsum (or vmean).
>>
>>
>> |    Time |
>> |---------|
>> | 1:06:00 |
>> | 0:52:30 |
>> | 2:00:00 |
>> |---------|
>> |       3 |
>> #+TBLFM: @5$1=vsum(@I..@II);T
>>
>>
>> Am I doing something wrong?
>
> Yes, `vsum' works just on numbers, not times.
>
>> Could this be made to work?
> Here's a elisp function that does what you want (assuming it's
> hours:minutes:seconds -- if not tweak the numbers):
>
> #+begin_src elisp
> (defun h-m-s-vsum (times)
>    (loop for (h m s) in (mapcar (lambda (time)
>                              (mapcar #'string-to-int
>                                      (split-string time ":" 'omit-nulls)))
>                                 times)
>         collect (+ (* 3600 h) (* 60 m) s) into seconds
>         finally (return (let* ((second-sum (apply #'+ seconds))
>                                (seconds (let ((s (% second-sum 60)))
>                                           (decf second-sum s)
>                                           s))
>                                (minutes (let ((m (% second-sum 3600)))
>                                           (decf second-sum m)
>                                           (truncate (/ m 60))))
>                                (hours (/ second-sum 3600)))
>                           (format "%s:%s:%s" hours minutes seconds)))))
> #+end_src elisp
>
> The table has to be
>
> |    Time |
> |---------|
> | 1:06:00 |
> | 0:52:30 |
> | 2:00:00 |
> |---------|
> | 3:58:30 |
> #+TBLFM: @5$1='(h-m-s-vsum '(@I..@II))
>
> Hope that helps.
> Maybe there is an easier way. I hope there is ;)
>
> Michael