all done

labs-set-1/preamble.tex

@@ -32,6 +32,12 @@
 \usepackage{tikz}
 \usepackage{titletoc}
 
+% add this to the preamble (near your other \usepackage lines)
+\usepackage{pgfplots}
+\pgfplotsset{compat=1.18} % or compat=newest if you prefer
+\usepgfplotslibrary{colormaps} % enables 'viridis' etc.
+
+
 \newcommand\mycommfont[1]{\footnotesize\ttfamily\textcolor{blue}{#1}}
 \SetCommentSty{mycommfont}
 \newcommand{\incfig}[1]{%