Re: [Gnuplot-info] Errorbars not showing if specified as time/date data

[Federico M. <fed...@gm...>]

Thanks.

-F


On Tue, Aug 27, 2013 at 1:02 PM, Marek W. Gutowski <gu...@if...> wrote:
> Aha, now I see the problem clearly.
> Gnuplot doesn't recognize the third column as being written in current
> timefmt,
> as declared for ydata.   Instead it understands it as containing seconds
> (not necessarily the integer!).  Therefore parsing string like "00:00:52"
> produces
> exactly  zero (the tail of this string, i.e. ":00:52" is not interpreted as
> it is not a valid
> number).  Unfortunately, a command like
>         set yerror time
> seems not implemented.  Of course, it would be natural to expect the same
> format
> for ydata and yerror(bars), and, consequently, for xdata and xerror(bars) -
> but this
> is evidently not the case.  Overlooked?  Maybe, but It would be a headache
> to calculate yerrorbars as a combination of two or more columns, written in
> mixed
> formats, some of them numeric and others as time.  Sooner or later somebody
> would try this ...
> This is probably why the trick
>         plot [0:10] "-" u 1:2:($2-$3):($2+$3) with errorbars
> doesn't work either.
>
> All that remains is to reformat your input, either "on the fly" (I don't
> know how
> but it's possible) or outside gnuplot, to effectively have third column in
> numeric
> format, more precisely in seconds.
>
> Marek
>
>
> Federico Maggi wrote:
>>
>> Marek, Hans,
>>
>> On Mon, Aug 26, 2013 at 11:15 PM, Hans-Bernhard Bröker
>> <HBB...@t-...>  wrote:
>>
>>>> I am using gnuplot 4.4 patchlevel 4 (compied via homebrew) on Mac OS X
>>>> 10.7.5 (GCC 4.2.1).
>>>
>>>
>>> Hmmm... if you're compiling your own gnuplot, why would you pick such an
>>> outdated version?
>>
>>
>> I've upgraded to 4.6: the remainder of this email refers to tests
>> conducted with 4.6 patchlevel 3.
>>
>> On Mon, Aug 26, 2013 at 8:01 PM, Marek W. Gutowski<gu...@if...>
>> wrote:
>>>
>>> Looks like you error column (3) is not always in correct (time) format.
>>> Otherwise the plot is as expected, I don't see anything wrong with it.
>>
>>
>> that was my point:
>>
>> 1) this script shows *no* errobars, whereas it should:
>>
>> # code: https://gist.github.com/4dfa75d1eeb7f4e5b54f
>> # screenshot: http://screencast.com/t/jUY84naoxltV
>> reset
>> set timefmt "%H:%M:%S"
>> set ydata time
>> plot "-" u 1:2:3 w yerrorbars t ''
>> 1 00:02:16 00:00:52
>> 2 00:02:14 00:02:00
>> 3 00:02:01 00:00:52
>> 4 00:01:58 00:00:52
>> 5 00:01:45 00:00:52
>> 6 00:01:32 00:01:01
>> 7 00:01:32 00:00:52
>> 8 00:01:22 00:00:52
>> 9 00:01:17 00:00:52
>>
>>
>> 2) this script shows errobars correctly, as expected:
>>
>> # code: https://gist.github.com/c15f8ddc754f330acda7
>> # screenshot: http://screencast.com/t/VycQZFvRrlU
>> reset
>> plot "-" u 1:2:3 w yerrorbars t 'Script 2'
>> 1 16 2
>> 2 14 0
>> 3 01 2
>> 4 58 2
>> 5 45 2
>> 6 32 1
>> 7 32 2
>> 8 22 2
>> 9 17 2
>>
>>
>> 3) this script (correctly) shows the errorbars if these are specified
>> as plain integers, whereas it does not shows any errorbars if these
>> are specified as time values. Why?
>>
>> # code: https://gist.github.com/d52c622c19c2103792d4
>> # screenshot: http://screencast.com/t/cPucckjITl
>>
>> reset
>> set timefmt "%H:%M:%S"
>> set ydata time
>> plot "-" u 1:2:3 w yerrorbars t 'Script 3'
>> 1 00:02:16 00:00:52
>> 2 00:02:14 00:02:00
>> 3 00:02:01 2
>> 4 00:01:58 1.1
>> 5 00:01:45 2.3
>> 6 00:01:32 00:01:01
>> 7 00:01:32 1.5
>> 8 00:01:22 2
>> 9 00:01:17 3
>>
>>> Why the last character in your plot command is "t"?
>>
>>
>> it's the (empty) title specification.
>>
>> -F
>>
>>
>> ------------------------------------------------------------------------------
>> Introducing Performance Central, a new site from SourceForge and
>> AppDynamics. Performance Central is your source for news, insights,
>> analysis and resources for efficient Application Performance Management.
>> Visit us today!
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk
>> _______________________________________________
>> gnuplot-info mailing list
>> gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>
>
> --
> Marek W. Gutowski
> Institute of Physics PAS, ON-3.2, Al. Lotnikow 32/46
> 02-668 Warszawa, Poland, tel. +48-22-228436601 ext. 3122
> == To talk or not to talk?  Yes, talk, plain ASCII please ==
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



-- 
-Fede