Hi Marco,
the dateplot is a method to convert string-based date formats
(YYYY-MM-DD) to numbers. Since you already have the result of such a
transformation, you can safely use your numerical data (column
'datenum') -- and use the string-based time as tick labels.
An example could be
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.3}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xlabel=Time (MM:SS.sss),
ylabel=Wat lev,
xtick=data,
xticklabels={
00:00.000,
00:00.150,
00:00.230,
00:00.310,
00:00.470,
00:00.550,
00:00.630,
00:00.710,
00:00.870,
00:00.950,
00:01.030,
00:01.110
},
scaled x ticks=false,
xticklabel style={anchor=east,rotate=90},
]
\addplot table[x=Time,y=WatLev_m]
{
Time TimeMM:ss.sss WatLev_m
0.0000000000000000000 00:00.000 0.00000
0.0000017361016944051 00:00.150 0.00000
0.0000026620691642165 00:00.230 0.00010
0.0000035879202187061 00:00.310 0.00030
0.0000054398551583290 00:00.470 0.00110
0.0000063657062128186 00:00.550 0.00180
0.0000072916736826301 00:00.630 0.00270
0.0000082176411524415 00:00.710 0.00380
0.0000100694596767426 00:00.870 0.00660
0.0000109954271465540 00:00.950 0.00840
0.0000119212782010436 00:01.030 0.01030
0.0000128472456708550 00:01.110 0.01250
};
\end{axis}
\end{tikzpicture}
\end{document}
compare the attached pdf. The important aspects of the example are
"scaled x ticks=false" and the explicitly provided tick positions
(xtick=data) combined with explicitly provided tick label texts
(xticklabels). You might also be interested in the option 'xticklabels
from table={ \table or filename }{ colname }' (compare the manual).
This appears to be the simplest way to accomplish the task - maybe you
should enrich your samples with additional ticks in-between (either by
modifying your data table or simply by providing the tick positions +
labels).
Does this help you?
Best regards
Christian
Am 01.02.2012 09:27, schrieb Miani, Marco:
>
> Hello.
>
> When trying to plot my data, and using PGF plots, I came across the
> following issue:
>
> My data is a set of two columns (actually 3 but one is unimportant):
>
> - former is time (matLab’s) datenum temporal format. The time
> resolution am considering here, is of the order of (milli)seconds.
>
> - latter is some value (say oscillations).
>
> What follows is an example of the input file:
>
> % Time (datenum) Time(MM:ss.sss) WatLev (m)
>
> 0.0000000000000000000 00:00.000 0.00000
>
> 0.0000017361016944051 00:00.150 0.00000
>
> 0.0000026620691642165 00:00.230 0.00010
>
> 0.0000035879202187061 00:00.310 0.00030
>
> 0.0000054398551583290 00:00.470 0.00110
>
> 0.0000063657062128186 00:00.550 0.00180
>
> 0.0000072916736826301 00:00.630 0.00270
>
> 0.0000082176411524415 00:00.710 0.00380
>
> 0.0000100694596767426 00:00.870 0.00660
>
> 0.0000109954271465540 00:00.950 0.00840
>
> 0.0000119212782010436 00:01.030 0.01030
>
> 0.0000128472456708550 00:01.110 0.01250
>
> Problem:
>
> DATEPLOT does not have sufficient precision when swallowing datenum
> numbers (first column).
>
>
> Solution?:
>
> My question is if somebody has already encountered this problem and
> possibly solved it.
>
> Thanks
>
> Marco from Norderney, Germany
>
>
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