Yes, this might be the problem :-/ But every other function worked fine so far.
I noticed that there is sigma on y-axis and it shouldn't be there
I don't want to ask more, but since you have it properly working. Can you compile again with following code?
Code: Select all
\begin{tikzpicture}[scale=1.25]
\colorlet{col1}{blue!70}
\colorlet{col2}{blue!60}
\colorlet{col3}{blue!50}
\colorlet{col4}{blue!40}
\draw [help lines] (-4.25,-1.25) grid (4.25,1.5);
\draw [help lines,step=0.25cm] (-2.99,0) grid (2.99,0.99);
\draw[->] (0,-1.25) -- (0,1.5) node [above]
% {$\displaystyle
% \frac{1}{\sigma\sqrt{2\pi}}\exp\biggl(\frac{-x^2}{2\sigma^2}\biggr)
% $};
\begin{scope}[smooth,draw=gray!20,y=0.3989422804cm]
\filldraw [fill=col3] plot[id=f1,domain=-3:-2] function {exp(-x*x/2)}
-- (-2,0) -- (-3,0) -- cycle;
\filldraw [fill=col2] plot[id=f2,domain=-2:-1] function {exp(-x*x/2)}
-- (-1,0) -- (-2,0) -- cycle;
\filldraw [fill=col1] plot[id=f3,domain=-1:0] function {exp(-x*x/2)}
-- (0,0) -- (-1,0) -- cycle;
\filldraw [fill=col1] plot[id=f4,domain=0:1] function {exp(-x*x/2)}
-- (1,0) -- (0,0) -- cycle;
\filldraw [fill=col2] plot[id=f5,domain=1:2] function {exp(-x*x/2)}
-- (2,0) -- (1,0) -- cycle;
\filldraw [fill=col3] plot[id=f6,domain=2:3] function {exp(-x*x/2)}
-- (3,0) -- (2,0) -- cycle;
\draw[black] plot[id=f7,domain=-4.25:4.25,samples=100]
function {exp(-x*x/2)};
\end{scope}
\draw[->] (-4.25,0) -- (4.25,0) node [right] {$x$};
\foreach \pos/\label in {-3/$-3\sigma$,-2/$-2\sigma$,-1/$-\sigma$,
1/$\sigma$,2/$2\sigma$,3/$3\sigma$}
\draw (\pos,0) -- (\pos,-0.1) (\pos cm,-3ex) node
[anchor=base,fill=white,inner sep=1pt] {\label};
\draw (-0.1,1) -- (.1,1) node [right,fill=white,inner sep=1pt] {};
\foreach \pos/\percent/\height in {1/34/0.5,2/14/0.25,3/2/0.125,4/0.1/0.1}
{
\node[text=col\pos,anchor=base,yshift=2pt,xshift=-0.625cm,
fill=white,inner sep=1pt] at (\pos,\height) {$\percent\%$};
\node[text=col\pos,anchor=base,yshift=2pt,xshift=.625cm,
fill=white,inner sep=1pt] at (-\pos,\height) {$\percent\%$};
}
\end{tikzpicture}
Hope \sigma won't be there this time.
I really have to thank you again. I didn't expect much when I registered to this forum, but you are doing fine job here! I appreciate your work very much.