# Detail on monotony table

Well here is what I finally want to achieve.

The following code:

\documentclass[10pt]{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[english,greek]{babel}
\usepackage[iso-8859-7]{inputenc}
\usepackage{pgf,tikz}
\usepackage{tkz-tab}
\usetikzlibrary{shapes,snakes,arrows,backgrounds}
\usepackage{color}

\begin{document}

\begin{center}
\begin{tikzpicture}
\tkzTabInit[espcl=2]
{$x$/1,$f'(x)$ /1, $f(x)$ /2}{$-\infty$,$0$, $1$ , $+\infty$}%
\tkzTabLine{,+,d,-,z,+}
\tkzTabVar[color=red]%
{ -/ $-\infty$ / ,+D+/$0$ / $+\infty$ , -/ $e$ , +/ $+\infty$}
\end{tikzpicture}
\end{center}
\end{document}


prodcues this motonony table.

The result is perfect. However, is it possible that the dashed line that I have under 1 displaying the zero of the derivative be extended further down till e? That is the dashed line covers also the other cell of f reaching down till e ?

I have not found something in the Altermundus manual, so I guess this cannot be done (?) .

Here's one option using a \draw and the internal names associated to the nodes in tkz-tab to extend the line downwards up to the "e":

\draw[dotted] (N32) -- (FR32);


The complete code:

\documentclass[10pt]{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[english,greek]{babel}
\usepackage[iso-8859-7]{inputenc}
\usepackage{pgf,tikz}
\usepackage{tkz-tab}
\usetikzlibrary{shapes,snakes,arrows,backgrounds}
\usepackage{color}

\begin{document}

\begin{center}
\begin{tikzpicture}
\tkzTabInit[espcl=2]
{$x$/1,$f'(x)$ /1, $f(x)$ /2}{$-\infty$,$0$, $1$ , $+\infty$}%
\tkzTabLine{,+,d,-,z,+}
\tkzTabVar[color=red]%
{ -/ $-\infty$ / ,+D+/$0$ / $+\infty$ , -/ $e$ , +/ $+\infty$}
\draw[dotted] (N32) -- (FR32);
\end{tikzpicture}
\end{center}
\end{document}


• could you explain how the new command actually works? I don't undestand since it is the first time I see it. Sep 6, 2015 at 20:30
• @Tolaso It's a standard TikZ \draw command; in its simpler form you provide two coordinates and a path specification (-- in this case, i.e., a straight line) with some optional modifier (dotted in my answer) and a straight dotted line is drawn joining the two coordinates. Sep 6, 2015 at 22:11
• Well, I know the command but I don't understand the number (N32)--(FR32). This is the part of the command I did not understand. Where do the numbers come in? Sep 7, 2015 at 11:48
• @Tolaso Those are the internal names of the coordinates and nodes used by the package to place the elements; some of the naming conventions used by the package author start with F, S, N, FR; you have to read the code of the package to see how each element is named. Sep 7, 2015 at 13:41