Hi Denis,
thanks for your request and for the inquiry.
I accept that as feature request and I have added it to the todo list.
The ETA is some time in the future though: the next two releases are
planned for other bigger topics.
Regarding your questions:
1. Do you think this is a safe way of doing?
--> Looks good to me. I believe you tested it until you were satisfied?
2. Is there a better way?
--> This is the best approach currently.
3. Could `pgfplots` be able to directly handle data time (without date)
format?
--> "be made able": yes. I accept that as feature request.
I suggest to stick with the answer(s). Chances are good that I will
integrate them into pgfplots eventually. Perhaps the current
developments of a lua backend might help here as well.
Kind regards
Christian
Am 20.10.2014 08:54, schrieb Denis Bitouzé:
> Hi,
>
> on http://tex.stackexchange.com/q/79252/18401, a solution was given to
> let the user have input data of the form `HH:MM:SS` (without
> date). Unfortunately, as pointed out in comments, this solution fails if
> `HH` is `08` or `09` with the error:
>
> ┌────
> │ ! Package PGF Math Error: Digit '8' invalid for base 8 (in
> '08*3600-08*3600+54*60+14.75')
> └────
>
> A workaround was pointed out on the present list:
>
> ┌────
> │
> http://pgfplots-features.706524.n3.nabble.com/Pgfplots-features-Octal-numbers-td3124234.html
> └────
>
> just by removing the leading zeros but it is not always desirable to
> manually change the data. Moreover, the usecase of this post, and hence
> the answer given by Christian, are not relevant for data of the form
> `HH:MM:SS`.
>
> Thanks to http://tex.stackexchange.com/a/52233/18401, a possible
> workaround is, in (see http://tex.stackexchange.com/q/79252/18401), to
> replace the "brut" hours, minutes and second (#1, #2 and #3):
>
> --8<---------------cut here---------------start------------->8---
> \pgfmathparse{#1*3600-\pgfkeysvalueof{/pgfplots/timeplot
> zero}*3600+#2*60+#3}
> --8<---------------cut here---------------end--------------->8---
>
> from:
>
> --8<---------------cut here---------------start------------->8---
> \def\transformtime#1:#2:#3!{
> \pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}
> \pgfmathparse{#1*3600-\pgfkeysvalueof{/pgfplots/timeplot
> zero}*3600+#2*60+#3}
> \pgfkeys{/pgf/fpu=false}
> }
> --8<---------------cut here---------------end--------------->8---
>
> by their digital counterparts (`\the\numexpr...\relax`):
>
> --8<---------------cut here---------------start------------->8---
> \pgfmathparse{%
> \the\numexpr#1\relax*3600%
> -\pgfkeysvalueof{/pgfplots/timeplot zero}*3600%
> +\the\numexpr#2\relax*60%
> +\the\numexpr#3\relax%
> }
> --8<---------------cut here---------------end--------------->8---
>
> Now, some questions :)
>
> 1. Do you think this is a safe way of doing?
> 2. Is there a better way?
> 3. Could `pgfplots` be able to directly handle data time (without date)
> format?
>
> Thanks by anticipation.
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