这是对上一个问题我的，稍微补充一下。我想循环遍历文件中的数据并以列表形式提供绘图样式。在旧问题中，我只给出了颜色和索引，而 Christian Hupfer 想出了一个可行的解决方案就像略有变化，厘米休斯。
现在，我想更精确地指定样式。例如，我希望能够像以下 MWE 中那样绘制虚线或虚线
\documentclass{article}
\usepackage{xcolor}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}
\pgfplotsforeachungrouped \foridx/\forcol/\forstyle in {1/black/solid,2/red/dashed,3/green/dotted,4/blue/solid,5/orange/dotted}{
\expandafter\addplot\expandafter[\forcol,\forstyle]{x^\foridx};
}
\end{axis}
\end{tikzpicture}
\end{document}
如果我省略\forstyle列表中的第三个参数，我会得到 Christian Hupfer 的解决方案，该解决方案有效。像这样，它会产生许多错误：
! Undefined control sequence.
<argument> ...pgfplots@foreach@loc@TMPb \forstyle
l.9 }
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Missing character: There is no 1 in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no l in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no c in font nullfont!
Missing character: There is no k in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no s in font nullfont!
Missing character: There is no o in font nullfont!
Missing character: There is no l in font nullfont!
Missing character: There is no i in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 2 in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no r in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no s in font nullfont!
Missing character: There is no h in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 3 in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no g in font nullfont!
Missing character: There is no r in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no o in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 4 in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no l in font nullfont!
Missing character: There is no u in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no s in font nullfont!
Missing character: There is no o in font nullfont!
Missing character: There is no l in font nullfont!
Missing character: There is no i in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 5 in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no o in font nullfont!
Missing character: There is no r in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no g in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no / in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no o in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no d in font nullfont!
! Undefined control sequence.
\pgfkeyscurrentkey ->\forstyle
l.9 }
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
This error message was generated by an \errmessage
command, so I can't give any explicit help.
Pretend that you're Hercule Poirot: Examine all clues,
and deduce the truth by order and method.
NOTE: coordinate (2Y5.0e0],3Y0.0e0]) has been dropped because it is unbounded (
in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y4.5833334e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y4.1666669e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y3.7500003e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y3.3333337e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y2.9166672e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y2.5000006e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y2.083334e0],3Y0.0e0]) has been dropped because it is unboun
ded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y1.6666675e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y1.2500009e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y8.333344e-1],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y4.166677e-1],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (2Y9.9e-7],3Y0.0e0]) has been dropped because it is unbounded
(in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y4.1666573e-1],3Y0.0e0]) has been dropped because it is unbo
unded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y8.3333243e-1],3Y0.0e0]) has been dropped because it is unbo
unded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y1.24999913e0],3Y0.0e0]) has been dropped because it is unbo
unded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y1.6666656e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y2.0833322e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y2.4999988e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y2.9166653e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y3.3333319e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y3.7499985e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y4.166665e0],3Y0.0e0]) has been dropped because it is unboun
ded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y4.5833316e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
! Package PGF Math Error: Could not parse input '' as a floating point number,
sorry. The unreadable part was near ''. (in 'x^').
See the PGF Math package documentation for explanation.
Type H <return> for immediate help.
...
l.9 }
(That was another \errmessage.)
NOTE: coordinate (1Y4.9999982e0],3Y0.0e0]) has been dropped because it is unbou
nded (in y). (see also unbounded coords=jump).
使用 cmhughes 链接的代码片段，我无法让它工作，并且出现类似的错误（可能是同一个问题）
\addplot因此我尝试在列表中给出参数：
\pgfplotsforeachungrouped \foridx/\forstyle in {1/{black,solid},2/{red,dashed},3/{green,dotted},4/{blue,solid},5/{orange,dotted}}{
\expandafter\addplot\expandafter[\forstyle]{x^\foridx};
}
编译后，它只产生一条黑实线（它只循环遍历第一个元素）
事实上，我找不到任何使用三个变量的示例。如何使用pgffor三个或更多变量？
答案1
在PGFPlotsToDo 列表 (v1.14) 在第 35 页这个已经写完了：
\pgfplotsforeachungrouped不能与三个或更多参数组合，例如\foreach
因此，目前必须找到另一种解决方案。但幸运的是，在这种情况下，通过定义自定义 ，可以轻松实现这一点cycle list。
有关更多详细信息，请查看代码中的注释。
% used PGFPlots v1.14
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
% create a cycle list that fits your needs ...
\pgfplotscreateplotcyclelist{mylist}{
{black,solid},
{red,dashed},
{green,dotted},
{blue,solid},
{orange,dotted}%
}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
ymin=-100,
ymax=100,
legend pos=south east,
% ... and apply it here ...
% (or in `\pgfplotsset' if it should be used as default for all plots)
cycle list name=mylist,
]
% ... then your loop simplifies to ...
\foreach \i in {1,...,5} {
% ... where I just added `very thick' so the result can be
% seen easier
\addplot+ [very thick] {(x)^\i};
\addlegendentryexpanded{$x^\i$};
}
\end{axis}
\end{tikzpicture}
\end{document}
