This happens because PGFPlots only uses one "stack" per axis: You're stacking the second confidence interval on top of the first. The easiest way to fix this is probably to use the approach described in "Is there an easy way of using line thickness as error indicator in a plot?": After plotting the first confidence interval, stack the upper bound on top again, using stack dir=minus. That way, the stack will be reset to zero, and you can draw the second confidence interval in the same fashion as the first:
\documentclass{standalone}
\usepackage{pgfplots, tikz}
\usepackage{pgfplotstable}
\pgfplotstableread{
temps y_h y_h__inf y_h__sup y_f y_f__inf y_f__sup
1 0.237340 0.135170 0.339511 0.237653 0.135482 0.339823
2 0.561320 0.422007 0.700633 0.165871 0.026558 0.305184
3 0.694760 0.534205 0.855314 0.074856 -0.085698 0.235411
4 0.728306 0.560179 0.896432 0.003361 -0.164765 0.171487
5 0.711710 0.544944 0.878477 -0.044582 -0.211349 0.122184
6 0.671241 0.511191 0.831291 -0.073347 -0.233397 0.086703
7 0.621177 0.471219 0.771135 -0.088418 -0.238376 0.061540
8 0.569354 0.431826 0.706882 -0.094382 -0.231910 0.043146
9 0.519973 0.396571 0.643376 -0.094619 -0.218022 0.028783
10 0.475121 0.366990 0.583251 -0.091467 -0.199598 0.016664
}{\table}
\begin{document}
\begin{tikzpicture}
\begin{axis}
% y_h confidence interval
\addplot [stack plots=y, fill=none, draw=none, forget plot] table [x=temps, y=y_h__inf] {\table} \closedcycle;
\addplot [stack plots=y, fill=gray!50, opacity=0.4, draw opacity=0, area legend] table [x=temps, y expr=\thisrow{y_h__sup}-\thisrow{y_h__inf}] {\table} \closedcycle;
% subtract the upper bound so our stack is back at zero
\addplot [stack plots=y, stack dir=minus, forget plot, draw=none] table [x=temps, y=y_h__sup] {\table};
% y_f confidence interval
\addplot [stack plots=y, fill=none, draw=none, forget plot] table [x=temps, y=y_f__inf] {\table} \closedcycle;
\addplot [stack plots=y, fill=gray!50, opacity=0.4, draw opacity=0, area legend] table [x=temps, y expr=\thisrow{y_f__sup}-\thisrow{y_f__inf}] {\table} \closedcycle;
% the line plots (y_h and y_f)
\addplot [stack plots=false, very thick,smooth,blue] table [x=temps, y=y_h] {\table};
\addplot [stack plots=false, very thick,smooth,blue] table [x=temps, y=y_f] {\table};
\end{axis}
\end{tikzpicture}
\end{document}
You've asked quite a few questions! It's generally best to ask one, focused question on this site ;)
But, here's an attempt to get through your questions....
Labels, such as $y = \sin(x), would make the graphs more presentable.
I guess directly under the y-axis.
You could use, for example,
\begin{axis}[
Axis Style,
xtick={
-6.28318, -4.7123889, -3.14159, -1.5708,
1.5708, 3.14159, 4.7123889, 6.28318
},
xticklabels={
$-2\pi$, $-3\pi/2$, $-\pi$, $\pi/2$,
$\pi/2$, $\pi$, $3\pi/2$, $2\pi$
},
ylabel={$y=\sin(x)$}, %<---- new bit
]
or else, for example,
...
\addplot [mark=none, ultra thick, blue] {sin(deg(x))};
\addlegendentry{$y=\sin(x)$} %<---- new bit
...
You might also want to adjust the legend position using legend pos=...
Arrowheads should be at both ends of the axes. They are currently at
one end.
You can use,
\pgfkeys{/pgfplots/Axis Style/.style={
width=.3\textwidth, %height=5cm,
axis x line=center,
axis y line=middle,
samples=100,
ymin=-1.5, ymax=1.5,
xmin=-7.0, xmax=7.0,
domain=-2*pi:2*pi,
axis line style=<->, %<----- new bit
}}
or otherwise use pgfplotsset (as demonstrated below).
The scale is suitable for the graphs of the sine and cosine functions
but not for the tangent function. Maybe have the y-axis include -10
and 10.
Try using, for example,
\begin{axis}[
Axis Style,
xtick={-6.28318, -4.7123889, ..., 6.28318},
scaled x ticks={real:3.1415},
xtick scale label code/.code={},
ymin=-10,ymax=10, %<---- new bit
]
Changing the scale for this graph may have the labels along the axes
drawn over by the graph of the tangent function. Is there a code for
putting labels (in nodes) over other features of a graph?
I believe you want the axis on top key for this.
Currently, the y-axes of the three graphs are aligned. How can I have
the x-axes are aligned?
Remove the blank lines between your figures - note that you'll need to adjust the text width to get them to fit nicely - consider the geometry package for this.
What does mark=none instruct TikZ to do? What other options are there
for mark?
mark=none means that you only get the curve, and not circles (or other marks) at the sample points along the way. There are a lot of other options - see Section 4.7 of the pgfplots for details.
Here's a complete bit of code to play with that implements the things I have mentioned.
% arara: pdflatex
% !arara: indent: {overwrite: yes}
\documentclass{article}
\usepackage{pgfplots}
\usepackage[margin=1cm]{geometry}
\pgfplotsset{Axis Style/.style={
width=.3\textwidth, %height=5cm,
axis x line=center,
axis y line=middle,
samples=100,
ymin=-1.5, ymax=1.5,
xmin=-7.0, xmax=7.0,
domain=-2*pi:2*pi,
axis line style=<->,
}}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
Axis Style,
xtick={
-6.28318, -4.7123889, -3.14159, -1.5708,
1.5708, 3.14159, 4.7123889, 6.28318
},
xticklabels={
$-2\pi$, $-3\pi/2$, $-\pi$, $\pi/2$,
$\pi/2$, $\pi$, $3\pi/2$, $2\pi$
},
ylabel={$y=\sin(x)$},
]
\addplot [mark=none, ultra thick, blue] {sin(deg(x))};
\addlegendentry{$y=\sin(x)$}
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[
Axis Style,
xtick={
-6.28318, -4.7123889, -3.14159, -1.5708,
1.5708, 3.14159, 4.7123889, 6.28318
},
xticklabels={
$-2\pi$, $-3\pi/2$, $-\pi\hspace{0.30cm}$, $\pi/2$,
$\pi/2$, $\pi\hspace{0.10cm}$, $3\pi/2$, $\hspace{0.25cm} 2\pi$
}
]
\addplot [mark=none, ultra thick, red] {cos(deg(x))};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[
Axis Style,
xtick={-6.28318, -4.7123889, ..., 6.28318},
scaled x ticks={real:3.1415},
xtick scale label code/.code={},
ymin=-10,ymax=10,
]
\addplot [mark=none, ultra thick, brown] {tan(deg(x))};
\end{axis}
\end{tikzpicture}
\end{document}
Best Answer
So, the error were two: you missed a semicolon and you got the
\dfraccommand wrong, and the same line missed a;Apart from the
;the\dfraccommand is a math mode command which tells toLaTeXto typeset a fraction, like it was in display mode even if it's inline.Here you don't want to typeset a fraction, but to specify a function value, so no typesetting command are required
So it would become:
\addplot[domain=2:5, blue]{1/(x-2)};as suggested by @Daleif.Also to write your curve you should be able to understand the command usages. I will try and summarize them, just in case:
addplotsimply tellstikzto draw the specific instruction. Thedomainparameter specifies the domain of the specific (part) of the plot, and it receives the function to draw. When used in the bottom two instructions, it tells to add to draw the objectsoldotandholdotat the specific coordinatessoldotandholdotare defined to represent solid and hollow dots respectively.\drawcommands connect the discontinuity points to one another.If you understand that, to draw your plot is simply a matter of adjusting the parameters:
With result: