Hi Joel,
you can
a) manually fix your tick labels using
ytick={0,1,...,5},
yticklabels={00,01,02,03,04,05},
or
b) make a more-or-less general approach which fixes it automatically using
\begin{axis}[yticklabel={%
$
\ifdim\tick pt<10pt
0%
\fi
\pgfmathprintnumber{\tick}$%
},%
]
...
Here, the \ifdim\tick pt < 10pt is a TeX comparison which works if the
numbers are small. The 'pt' suffix is here because TeX can only compare
in units of point.
The approach will probably fit into your approach, although it needs to
be modified for negative numbers.
c) try to experiment with the sizes of the label nodes which is
preferrable over a) and b). Tikz offers the minimum width approach:
yticklabel style={minimum width=3em}
d) exclude the axis descriptions explicitly from the external image's
bounding box. This last approach is what I have done to fix the
alignment in such cases.
To do so, you can use the 'trim axis right' and/or 'trim axis left'
features. The following example is copied from the manual, section
"Alignment":
\begin{center}
\begin{tabular}{rl}
\begin{tikzpicture}[baseline,trim axis left]
\begin{axis}
\addplot {x};
\end{axis}
\end{tikzpicture}
&
\begin{tikzpicture}[baseline,trim axis right]
\begin{axis}[
ylabel={$f(x)=x^2$},
yticklabel pos=right,
ylabel style={font=\Huge}]
\addplot {x^2};
\end{axis}
\end{tikzpicture}
\\
%
\begin{tikzpicture}[baseline,trim axis left]
\begin{axis}[xlabel=$x$,xlabel style={font=\Huge}]
\addplot {x^3};
\end{axis}
\end{tikzpicture}%
&
\begin{tikzpicture}[baseline,trim axis right]
\begin{axis}[yticklabel pos=right]
\addplot {x^4};
\end{axis}
\end{tikzpicture}%
\\
\end{tabular}%
\end{center}
I hope one of the approaches is what you had in mind. I encourage you to
consider the last one.
Best regards
Christian
PS
I posted a copy of this reply to the mailing list since it might be of
general interest.
Am 31.07.2011 05:18, schrieb Joel:
> Hello Christian,
>
> I have two plots which I externalize to an EPS file. However, the y-axis tick
> labels are different: the first plot has 0, 1, ... , 5, while the second has
> 0, 1, ..., 10. This causes the plots to have a slightly different width,
> since the 2nd plot has a wider y-axis tick label.
>
> Is it possible to print the axis tick labels in a fixed width format, padding
> shorter labels with spaces, so the plots will have the same width. For
> example:
> plot 1 y tick labels:<space>0 ...<space>5
> plot 2 y tick labels:<space>0 ... 10
>
> TIA,
> Joel.
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