以下代码示例借用自
我的电脑配置是
- Windows XP SP.3 日文版，
- MiKTeX 2.9（已更新），
- TeXmaker 3.5 或 TexStudio 2.4 和
- gnuplot 4.6。
代码示例在英文版 Windows XP 上编译正确。
测试 1
代码
\documentclass[border=2pt]{standalone}
\usepackage{pgfplots}
\begin{filecontents}{test.dat}
2 12
5 55
10 96
20 135
50 144
100 147
200 147
500 146
\end{filecontents}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xmode=log,
ymode=linear,
axis x line*=bottom,
axis y line*=left,
tick label style={font=\small},
grid=both,
tick align=outside,
tickpos=left,
xlabel= {[ACh]} (nM),
ylabel=Response (mm),
xmin=0.1, xmax=1000,
ymin=0, ymax=160,
width=0.8\textwidth,
height=0.6\textwidth,
]
\addplot[only marks] file {test.dat};
\addplot+[raw gnuplot, draw=red, mark=none, smooth] gnuplot {
set log x;
f(x)=Ymax/(1+(EC50/x)^nH);
Ymax=150;
nH=2;
EC50=60;
fit f(x) 'test.dat' using 1:2 via Ymax,EC50,nH;
plot [x=0.1:1000] f(x);
};
% Below is the correct line using the equation: {Ymax/(1+(EC50/[A])^nH)}
\addplot[draw=blue, domain=0.1:1000, smooth] {147.5/(1+(6.75/x)^1.95)};
\end{axis}
\end{tikzpicture}
\end{document}
输出
红色图（由计算得出gnuplot）向左移动。
测试 2
代码
\documentclass[border=2pt]{standalone}
\usepackage{pgfplots,pgfplotstable}
\begin{filecontents}{drc1.dat}
2 17
5 55
10 96
20 125
50 144
100 147
200 147
500 146
\end{filecontents}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
legend pos=north west,
xmode=log,
ymode=linear,
axis x line*=bottom,
axis y line*=left,
tick label style={font=\small},
grid=both,
tick align=outside,
tickpos=left,
xlabel= {[ACh]} (nM),
ylabel=Response (mm),
xmin=0.1, xmax=1000,
ymin=0, ymax=160,
width=0.7\textwidth,
height=0.4\textwidth,
]
\addplot[only marks, mark size=1.8, black] file {drc1.dat};
\addlegendentry[anchor=mid,font=\tiny]{Experiment 1}
\addplot+[raw gnuplot, red, mark=none, smooth] gnuplot {
set log x;
f(x)=Ymax/(1+(EC50/x)^nH);
Ymax=150;
nH=1;
EC50=50;
set fit errorvariables;
fit f(x) 'drc1.dat' using 1:2 via Ymax,EC50,nH;
plot [x=0.1:1000] f(x);
set print "parameters.dat"; % Open a file to save the parameters into
print Ymax, Ymax_err; % Write the parameters to file
print nH, nH_err;
print EC50, EC50_err;
};
\addlegendentry[font=\tiny, text depth=2ex]{
\pgfplotstableread{parameters.dat}\parameters % Open the file Gnuplot wrote
\pgfplotstablegetelem{0}{0}\of\parameters \pgfmathsetmacro\paramA{\pgfplotsretval} % Get first element, save into \paramA
\pgfplotstablegetelem{1}{0}\of\parameters \pgfmathsetmacro\paramB{\pgfplotsretval}
\pgfplotstablegetelem{2}{0}\of\parameters \pgfmathsetmacro\paramC{\pgfplotsretval}
$\frac{\pgfmathprintnumber{\paramA}}{\left(1+\frac{\pgfmathprintnumber{\paramB}}{[ACh]}\right)^{\pgfmathprintnumber{\paramC}}}$
}
\end{axis}
\end{tikzpicture}
\pgfplotstabletypeset[
dec sep align,
fixed,
columns/0/.style={column name=Parameter},
columns/1/.style={column name=Standard Error}
]{parameters.dat}
\end{document}
输出
结果是一样的：gnuplot曲线向左移动。
请告诉我为什么会发生这种情况。
日志中有警告
LaTeX Warning: Overwriting file `./drc1.dat'.
......
! Package pgfplots Warning: running in backwards compatibility mode (unsuitable tick labels; missing features). Consider writing \pgfplotsset{compat=1.6} into your preamble.
PGFPlots: reading {drc1.dat}
runsystem(gnuplot curveshitf.pgf-plot.gnuplot)...disabled (restricted).
......
PGFPlots: reading {curveshitf.pgf-plot.table}
NOTE: coordinate (-1.0000000e+000,1.3778365e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-9.5959596e-001,1.6059627e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-9.1919192e-001,1.8718116e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-8.7878788e-001,2.1816037e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-8.3838384e-001,2.5425793e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-7.9797980e-001,2.9631632e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-7.5757576e-001,3.4531556e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-7.1717172e-001,4.0239527e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-6.7676768e-001,4.6888008e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-6.3636364e-001,5.4630898e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-5.9595960e-001,6.3646891e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-5.5555556e-001,7.4143341e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-5.1515152e-001,8.6360674e-001) has been dropped because it is unbounded (in x).
NOTE: coordinate (-4.7474747e-001,1.0057741e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-4.3434343e-001,1.1711584e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-3.9393939e-001,1.3634852e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-3.5353535e-001,1.5870537e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-3.1313131e-001,1.8468179e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-2.7272727e-001,2.1484748e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-2.3232323e-001,2.4985601e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-1.9191919e-001,2.9045527e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-1.5151515e-001,3.3749826e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-1.1111111e-001,3.9195432e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-7.0707071e-002,4.5492015e+000) has been dropped because it is unbounded (in x).
NOTE: coordinate (-3.0303030e-002,5.2763015e+000) has been dropped because it is unbounded (in x).
在序言中，我补充说
\pgfplotsset{compat=1.6}
\pgfplotsset{filter discard warning=false}
\listfiles
为了调用 gnuplot，我添加了 -enable-write18，它可以制作如下图表。http://www.texample.net/tikz/examples/gnuplot-basics/做完所有事，看上去没什么变化。
文件列表是这样的
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size11.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
pgfplots.sty 2012/08/23 v1.6.1 (git show 1.6.1 )
tikz.sty 2010/10/13 v2.10 (rcs-revision 1.76)
pgf.sty 2008/01/15 v2.10 (rcs-revision 1.12)
pgfrcs.sty 2010/10/25 v2.10 (rcs-revision 1.24)
everyshi.sty 2001/05/15 v3.00 EveryShipout Package (MS)
pgfrcs.code.tex
pgfcore.sty 2010/04/11 v2.10 (rcs-revision 1.7)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2007/01/18 v1.5 graphics configuration of teTeX/TeXLive
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
pgfsys.sty 2010/06/30 v2.10 (rcs-revision 1.37)
pgfsys.code.tex
pgfsyssoftpath.code.tex 2008/07/18 (rcs-revision 1.7)
pgfsysprotocol.code.tex 2006/10/16 (rcs-revision 1.4)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
pgfcore.code.tex
pgfcomp-version-0-65.sty 2007/07/03 v2.10 (rcs-revision 1.7)
pgfcomp-version-1-18.sty 2007/07/23 v2.10 (rcs-revision 1.1)
pgffor.sty 2010/03/23 v2.10 (rcs-revision 1.18)
pgfkeys.sty
pgfkeys.code.tex
pgffor.code.tex
tikz.code.tex
pgfplotstable.sty 2012/08/23 Part of pgfplots
array.sty 2008/09/09 v2.4c Tabular extension package (FMi)
filecontents.sty 2011/10/08 v1.3 Create an external file from within a LaTeX
document
supp-pdf.mkii
在 Christian Feuersängern 的建议下，我在日志中找到了这一点
Package pgfplots: checking gnuplot -V : `\par ' (if this fails, set `/pgfplots/
gnuplot writes logscale=true|false')
! Package pgfplots Warning: Sorry, I can't reliably check which version of gnup
lot is available. I guess it is gnuplot < 4.4. Please set `/pgfplots/gnuplot wr
ites logscale=true|false' manually if anything fails.
Package pgfplots: I found gnuplot version < 4.4. This one writes log() coordina
tes. I'll handle it accordingly.
PGFPlots: reading {drc1.dat}
runsystem(gnuplot curveshitf.pgf-plot.gnuplot)...disabled (restricted).
我该怎么做才能解决这个问题？我用的是 gnuplot 4.6，但为什么写的是 4.4？
答案1
很久以前，gnuplot 存在兼容性问题：将 gnuplot <4.4 升级到 gnuplot 4.4 导致所有 pgfplots 对数图失败。4.4 之前的 Gnuplot 将对数坐标写入输出文件，而 4.4 以后的 gnuplot 则写入坐标而不应用对数。
这个问题已在 pgfplots 中得到修复（每当对数轴尝试调用 gnuplot 时，它都会发出版本切换）。不幸的是，这个修复raw gnuplot仅当关闭时才有效。
您可以写入\csname pgfplots@identify@gnuplot@logbehavior@checkversion\endcsname文档，重新运行 TeX，然后在文件中搜索“Package pgfplots: checking gnuplot -V ” .log。它会告诉您找到了什么。
如果您发现“软件包 pgfplots：我发现 gnuplot 版本 <4.4。这个写入 log() 坐标。我会相应地处理它。”那么这就是根本原因。
升级gnuplot将解决该问题。