\documentclass[a4paper]{article} \usepackage{pgfplots} \pgfplotsset{compat=newest} \usepgfplotslibrary{clickable} \begin{document} \begin{tikzpicture} \begin{axis}[xlabel=$x$,ylabel=$y$, domain=-2:2, samples=17, legend style={at={(0.5,0.98)},anchor=north,legend columns=-1} ] \addplot {x}; \addplot {x^2}; \addplot {x^3}; \legend{$x$,$x^2$,$x^3$} \end{axis} \end{tikzpicture} \begin{tikzpicture} \begin{semilogyaxis}[ xlabel=$x$,ylabel=$f(x)$, samples=10, domain=0:6, legend style={at={(0.5,0.98)},anchor=north,legend columns=-1} ] \addplot {exp(x)}; \addplot {10^x}; \legend{$\exp(x)$,$10^x$} \end{semilogyaxis} \end{tikzpicture} \end{document}