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* [bug] Negating time changes its value
@ 2012-04-30 14:25 Sebastien Vauban
2012-05-01 17:22 ` Bastien
From: Sebastien Vauban @ 2012-04-30 14:25 UTC (permalink / raw)
To: emacs-orgmode-mXXj517/zsQ

Hello,

Taking the opposite of a time (that is, "putting" a minus sign in front of it)
changes its value...

Here, a quick ECM to demonstrate the above:

* Grand total

#+TBLNAME: GrandTot
| Total | 232:11 |

* Other total

#+TBLNAME: OtherTot
| Total | 158:07 |

* Computation

** OK

The "other total time" is to be divided by 2, and substracted from the "grand
total time".

|                          |   Time |
|--------------------------+--------|
| Grand total              | 232:11 |
| - Other total / 2        |  79:03 |
|--------------------------+--------|
| = Total to be considered | 153:08 |
#+TBLFM: @2\$2=remote(GrandTot,@1\$2);T::@3\$2=remote(OtherTot,@1\$2)/2;T::@4\$2=@2-@3;T

That's correct.

** Not OK

However, I would like to clearly state that the amounts do no add, by having a

|                          |   Time |
|--------------------------+--------|
| Grand total              | 232:11 |
| - Other total / 2        | -80:56 |
|--------------------------+--------|
| = Total to be considered | 151:15 |
#+TBLFM: @2\$2=remote(GrandTot,@1\$2);T::@3\$2=-remote(OtherTot,@1\$2)/2;T::@4\$2=@2+@3;T

Whoops! Not the same results...

Other variations also fail:

|                          |   Time |
|--------------------------+--------|
| Grand total              | 232:11 |
| - Other total / 2        | -80:56 |
|--------------------------+--------|
| = Total to be considered | 151:15 |
#+TBLFM: @2\$2=remote(GrandTot,@1\$2);T::@3\$2=remote(OtherTot,@1\$2)/-2;T::@4\$2=@2+@3;T

or

|                          |   Time |
|--------------------------+--------|
| Grand total              | 232:11 |
| - Other total / 2        | -80:56 |
|--------------------------+--------|
| = Total to be considered | 151:15 |
#+TBLFM: @2\$2=remote(GrandTot,@1\$2);T::@3\$2=remote(OtherTot,@1\$2)/2*-1;T::@4\$2=@2+@3;T

Best regards,
Seb

--
Sebastien Vauban

* Re: [bug] Negating time changes its value
2012-04-30 14:25 [bug] Negating time changes its value Sebastien Vauban
@ 2012-05-01 17:22 ` Bastien
2012-05-02 10:12   ` Sebastien Vauban
From: Bastien @ 2012-05-01 17:22 UTC (permalink / raw)
To: Sebastien Vauban; +Cc: public-emacs-orgmode-mXXj517/zsQ

"Sebastien Vauban"
<wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org> writes:

> Taking the opposite of a time (that is, "putting" a minus sign in
> front of it) changes its value...

Thanks *a lot* for reporting this -- this was indeed a nasty bug.

--
Bastien

* Re: [bug] Negating time changes its value
2012-05-01 17:22 ` Bastien
@ 2012-05-02 10:12   ` Sebastien Vauban
0 siblings, 0 replies; 3+ messages in thread
From: Sebastien Vauban @ 2012-05-02 10:12 UTC (permalink / raw)
To: emacs-orgmode-mXXj517/zsQ

Hi Bastien,

Bastien wrote:
> "Sebastien Vauban"
> <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org> writes:
>
>> Taking the opposite of a time (that is, "putting" a minus sign in
>> front of it) changes its value...
>

Confirmed. Thanks a lot!

> Thanks *a lot* for reporting this -- this was indeed a nasty bug.

This is the least I could do... Thanks for your help.

Best regards,
Seb

--
Sebastien Vauban