multivariate-statistics/figures/schemes/coordinates_systems.tex

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\documentclass[tikz]{standalone}
\usepackage{tikz}
\usepackage{tkz-euclide}
\begin{document}
\begin{tikzpicture}
\tkzInit[xmax=5,ymax=5,xmin=-5,ymin=-5]
\tkzGrid
\tkzAxeXY
\draw[thick, latex-latex] (-1,4) -- (4,-6) node[anchor=south west] {$a$};
\end{tikzpicture}
\end{document}