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\documentclass{article}
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% set font encoding for PDFLaTeX or XeLaTeX
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%\usepackage{ifxetex}
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%\ifxetex
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%  \usepackage{fontspec}
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%\else
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%  \usepackage[T1]{fontenc}
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%  \usepackage[utf8]{inputenc}
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%  \usepackage{lmodern}
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%\fi
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% used in maketitle
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\title{Array in tex document}
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\author{Dominique Laurain}
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% Enable SageTeX to run SageMath code right inside this LaTeX file.
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% documentation: http://mirrors.ctan.org/macros/latex/contrib/sagetex/sagetexpackage.pdf
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% \usepackage{sagetex}
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\begin{document}
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\maketitle
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Some text before array.
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\[\begin{array}{c|r|l} \rm center & \rm right & \rm left \\ \hline c & r & l \end{array}
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\]
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\[\frac{a}{b}\]
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\end{document}
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%configuration={"latex_command":"latexmk -pdf -f -g -bibtex -synctex=1 -interaction=nonstopmode 'Help_Asksage_array.tex'"}
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