Re: Calc: Multiply time (hours) with a float

[be.proell@gmail.com (Bernhard Pröll)]

Hi,

FWIW, there is a org-table-toggle-formula-debugger command.


On Mon, Sep 19 2016, Karl Voit wrote:

> * Michael Welle <mwe012008@gmx.net> wrote:
>>
>> Karl Voit <devnull@Karl-Voit.at> writes:
>>
>>>> [...]
>>>>> #+TBLFM: @2$3='(* $2 (org-time-string-to-hours "$1"));L
>>>> or converting $2 to a number before the calculation should work also,
>>>> but is more to write ;).
>>>
>>> Hm. I still got #ERROR. I reduced my issue to calculate the float (for hours)
>>> without multiplying it with "value":
>> strange. I use the current Org version from git and Emacs 25.1.
>>
>>> | time [h:m:s] |   value | product |
>>> |--------------+---------+---------|
>>> |     09:15:00 | 2.54321 | #ERROR  |
>>>
>>> #+TBLFM: @2$3='(org-time-string-to-hours $1)
>> That works for me. The default interpretation of $1 is used and
>> therefore the value is fed into o-t-s-t-h as string.
>
> OK, this is my current issue then.
>
> I'm using Org from git/maint version 8.3.4
> (release_8.3.4-33-gd522fc) and GNU Emacs 24.5.1 (i686-pc-mingw32
> Windows) as well as Emacs 24.4.1 on GNU/Linux.
>
> Can somebody confirm my #ERROR behavior?
>
>>> #+TBLFM: @2$3='(org-time-string-to-hours $1);L
>> That doesn't work. I'm not sure, but I guess it is because you asked for 
>> literal interpretation and it is not clear what that would mean for
>> 09:15:00.
>
> I'd say the same.
>
>>> #+TBLFM: @2$3='(org-time-string-to-hours "$1");N
>> Here you ask for interpretation as numbers. So the o-t-s-t-h function
>> sees a stringified 9 as it's parameter value. Near, but still no t-shirt ;). 
>
> I was wondering whether or not the stringification is done before or
> after the number-conversion - as a test. It's an #ERROR anyway.
>
>>> ... each of the TBLFM results in the same error.
>> Well, none of them looks like the one I wrote:
>>
>> #+TBLFM: @2$3='(* $2 (org-time-string-to-hours "$1"));L
>
> ... which I tried first, got an #ERROR and analyzed the issue.
> Narrowing down to '(org-time-string-to-hours $1) is my issue since
> I now understand the handling of $2 which is according to the
> documentation.
>
>> You said, that gives an error, too. I have no idea, why. You can use
>> (message...) and (type-of ...) to look at the types and values that you
>> feed into your functions. Maybe that gives some insight?
>
> (type-of ...) -> very helpful
>
> | time [h:m:s] |   value | product |
> |--------------+---------+---------|
> |     09:15:00 | 2.54321 | #ERROR  |
>
> #+TBLFM: @2$3='(message (type-of (org-time-string-to-hours $1)))
> #+TBLFM: @2$3='(type-of (org-time-string-to-hours $1))
>
> ... both formulas lead to #ERROR in @2$3 with no message in the
> *Message* buffer.
>
> From my understanding, the first one should have caused an output of
> the type in the *Message* buffer and the second one should have
> placed something like "integer" into @2$3. Am I correct?
>
>> The variant with converting $2 to a number is:
>> #+TBLFM: @2$3='(* (string-to-number $2) (org-time-string-to-hours $1))
>
> Since the issue is with $1, the (string-to-number $2) (which is
> working) doesn't fix the #ERROR issue of $1 :-(
>
>
> Thank you *very* much for your explanations! I (and hopefully many
> others as well) am learning a lot here.

-- 
Bernhard