TikZ-PGF – Creating Tables of Signs and Variations with tkz-tab

tikz-pgf

I have a serious problem to solve. I would like to make a function monotonicity in my latex doc and i write

\begin{tikzpicture}
\tikzset{arrow style/.style = {blue,
->,
> = latex’,
shorten > = 6pt,
shorten < = 6pt}}
\tkzTabInit[espcl=5]{$x$ /1, $\ln x +1$ /1.5, $x \ln x$ /2}%
{$0$ ,$1/\E$ , $+\infty$}%
\tkzTabLine{d,-,z,+,}
\tkzTabVar%
{ D+/ / $0$ ,%
-/ \colorbox{black}{\textcolor{white}{$\dfrac{-1}{e}$}}/ ,%
+/ $+\infty$ / }%
\end{tikzpicture}

and it shows error. Is something with any package or some setting i have to to in the doc??

example

I sent you an exact example of what i try to do

Best Answer

Firstly it's preferable to give a complete example, then you need to define \E, you need to load amsmath.

\documentclass[11pt]{scrartcl}
\usepackage{tikz,tkz-tab,amsmath}
\usetikzlibrary{arrows}

\begin{document}
\newcommand{\E}{\mathrm{e}}
\begin{tikzpicture}
\tikzset{arrow style/.style = {blue,->,> = latex',
shorten > = 6pt,
shorten < = 6pt}}
\tkzTabInit[espcl=5]{$x$ /1, $\ln x +1$ /1.5, $x \ln x$ /2}{$0$ ,$1/\E$ , $+\infty$}%
\tkzTabLine{d,-,z,+,}
\tkzTabVar%
{ D+/ / $0$ ,%
-/ \colorbox{black}{\textcolor{white}{$\dfrac{-1}{e}$}}/ ,+/ $+\infty$ / }%
\end{tikzpicture}
\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Graphing a rational function and a vertical line using pgfplots

With my version of PGFplots, the \addplot command you provide doesn't even compile, so I had to guess what you want to achieve. In PGFplots you can just write fractions like this: 1/(x^2).

With Matthew's comment to Jake's answer to this question you can drawn an asymptote at x=1 by using the key vasymptote=1. In order to reliably truncate the plot without using many samples (orange curve), you can plot the two parts separately, specifying the domain so that is ends slightly before x=1 (black curve).

Some curve

\documentclass[10pt]{amsart}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}

\pgfplotsset{vasymptote/.style={
    before end axis/.append code={
        \draw[densely dashed] ({rel axis cs:0,0} -| {axis cs:#1,0})
        -- ({rel axis cs:0,1} -| {axis cs:#1,0});
    }
}}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
    axis equal image,
    axis lines=middle,
    xmin=-10,xmax=10,
    ymin=-10,ymax=10,
    enlargelimits={abs=1cm},
    axis line style={latex-latex},
    ticklabel style={fill=white},
    ytick={-10,10},
    xtick={-3,-10,10},
    vasymptote=1,
]
% This doesn't clip to y=-10:10 nicely
% because there are too few samples near the asymptote:
\addplot[very thick, orange, domain=-10:10,samples=200, restrict y to domain=-10:10]
    {(x^2+5*x+6)/(x^2+2*x-3)};

% Draw the two parts separately with individual domains:
\addplot[samples=50,domain=-10:1-0.27] {(x^2+5*x+6)/(x^2+2*x-3)};
\addplot[samples=50,domain=1+0.33:10]  {(x^2+5*x+6)/(x^2+2*x-3)};

\draw [fill=white] (-3,0) circle [radius=1.5pt]; % What is this?
\end{axis}
\end{tikzpicture}
\end{document}

tikz-pgf,tkz-fct – How to Resolve Strange Behavior of tkz-fct and log(x) Function in LaTeX

For function expressions you should use log(\x) , not log(x)

\documentclass{article}
\usepackage{tkz-fct}
\begin{document}
\begin{tikzpicture}
  \tkzInit[ymax=1.6, ymin=-1.6, xstep=3]
  % \tkzGrid
  \tkzDrawXY
  \tkzLabelX
  \tkzFct[domain= 0.01:10]{log(\x)} % log(x) ---> log(\x)
\end{tikzpicture}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Graphing a rational function and a vertical line using pgfplots

tikz-pgf,tkz-fct – How to Resolve Strange Behavior of tkz-fct and log(x) Function in LaTeX

Related Question