Hi William,
Am 28.01.2012 17:47, schrieb William Henney:
> The only thing missing now is some way to take per-point values from a
> data column for the "/pgfplots/nodes near coords align" parameter
> ("above", "below", "left", etc). That would help in avoiding
> collisions between the labels and would allow me to use a larger font
> size. Is it at all possible?
Yes, it is - and it is rather simple as well: you can modify your data
table such that it contains a further column 'align'.
Then, you tell pgfplots that the visualization depends on its data -- in
the very same way as you included the 'lambda' column. Once your data
table is modified, you can add the following two lines to make it happen:
nodes near coords align=\ALIGN,
visualization depends on={value\thisrow{align} \as \ALIGN},
Here, the 'value\thisrow{align} \as\ALIGN' means to take the expanded
value of \thisrow{align} verbatim, i.e. without parsing it as a number.
Without the key word 'value', it would have been parsed as number.
NOTE: you need to change you data table's column name for (M-O)/E : it
should not contain white spaces (since the default column separator is
white space).
Here is a complete example:
Cloudy El lambda Model Observed Error M/O
(M-O)/E align
NE_3 Ne3 3869 8.17686723274 10.80 1.4 0.76 -1.87
below
S_II S2 4070 10.4475816855 8.227 0.979 1.27 2.27
above
S_II S2 4078 2.99580775427 2.698 0.318 1.11 0.94
auto
C__2 C2 4267 0.207606269471 0.191 0.051 1.09
0.33 below
TOTL O3 4363 2.37236800689 2.011 0.207 1.18 1.75
auto
HE_1 He1 4471 4.65171605379 4.3 0.416 1.08 0.85 auto
FE_3 Fe3 4659 2.60331622015 0.338 0.042 7.70
53.94 auto
FE_3 Fe3 4702 1.44123467401 0.198 0.052 7.28
23.91 auto
FE_3 Fe3 4734 0.756129700232 0.117 0.036 6.46
17.75 auto
FE_3 Fe3 4755 0.47606006097 0.069 0.028 6.90
14.54 {anchor=south west}
H__1 H1 4861 100.0 100 7.2 1.00 0.00 auto
O__3 O3 4959 85.6877662453 80.94 5.91 1.06 0.80 auto
O__3 O3 5007 257.917681537 232.7 16.2 1.11 1.56 auto
N__2 N2 5755 8.17735206821 5.91 0.65 1.38 3.49 auto
HE_1 He1 5876 14.5187752486 14.48 1.35 1.00 0.03
auto
O__1 O1 6300 5.4711813156 4.846 0.446 1.13 1.40 auto
S__3 S3 6312 5.1304323418 3.88 0.357 1.32 3.50 auto
H__1 H1 6563 280.747361832 286 21.5 0.98 -0.24 auto
N__2 N2 6584 33.6017794459 33.84 2.54 0.99 -0.09
auto
HE_1 He1 6678 3.78215599287 3.514 0.316 1.08
0.85 auto
S_II S2 6731 0.637016569893 0.747 0.067 0.85
-1.64 auto
AR_3 Ar3 7135 26.2075170797 17.01 1.48 1.54 6.21
auto
Note that even the complicated choice {anchor=south west} is possible
here. This should allow all freedom that you need.
\documentclass{article}
\usepackage{fullpage}
\usepackage{txfonts}
\usepackage{pgfplots}
\newcommand\Ion[2]{\ensuremath{\mathrm{#1\,\scriptstyle #2}}}
\newcounter{ionstage}
\newcommand{\ion}[2]{% replace the aastex version
\setcounter{ionstage}{#2}%
\Ion{#1}{\Roman{ionstage}}}
% \usepgfplotslibrary{external}
% \tikzset{external/force remake}
% \tikzexternalize
\pgfplotsset{
compat=1.5.1, % most current version as of writing (27 Jan 2012)
% compat=newest, % select to always use latest version (may cause
minor appearance changes)
width=\textwidth,
}
\begin{document}
\begin{tikzpicture}
\begin{loglogaxis}[
xlabel={Observed Intensity, \(100 \times
I_{\lambda}/I(\mathrm{H}\beta)\)},
ylabel={Model Intensity, \(100 \times
I_{\lambda}/I(\mathrm{H}\beta)\)},
log ticks with fixed point,
legend columns=4,
legend pos=north west,
% transpose legend,
]
\addplot [
scatter/classes={
H1={mark=*,brown},%
He1={mark=*,green},%
C2={mark=triangle*,black},%
N2={mark=triangle*,cyan},%
O1={mark=*,orange},%
O3={mark=square*,orange},%
Ne3={mark=square*,blue},%
S2={mark=triangle*,red},%
S3={mark=square*,red},%
Ar3={mark=square*,magenta},%
Fe3={mark=square*,yellow}%
},
only marks, scatter,
scatter src=explicit symbolic,
point meta=explicit symbolic,
nodes near coords*={\tiny\pgfmathprintnumber[set thousands
separator={}]\LAMBDA\,\AA},
visualization depends on={\thisrow{lambda} \as \LAMBDA},
nodes near coords align=\ALIGN,
visualization depends on={value\thisrow{align} \as \ALIGN},
error bars/x dir=both,
error bars/x explicit,
error bars/y dir=none,
] table [
x=Observed,
y=Model,
x error=Error,
meta=El
] {ratios-177341.dat};
\addlegendentry{\ion{H}{1}}
\addlegendentry{\ion{He}{1}}
\addlegendentry{\ion{C}{2}}
\addlegendentry{[\ion{N}{2}]}
\addlegendentry{[\ion{O}{1}]}
\addlegendentry{[\ion{O}{3}]}
\addlegendentry{[\ion{Ne}{3}]}
\addlegendentry{[\ion{S}{2}]}
\addlegendentry{[\ion{S}{3}]}
\addlegendentry{[\ion{Ar}{3}]}
\addlegendentry{[\ion{Fe}{3}]}
\label[Ne3]{marker:Ne3}
\addplot [gray,domain=0.2:300] {x};
\end{loglogaxis}
\end{tikzpicture}
The marker for [\ion{Ne}{3}] is \ref{marker:Ne3}
\end{document}
Best regards
Christian
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