Irubataru

% Given the name of two tikz nodes, this dims the lines starting at node 1, ending at node 2
\newcommand{\dimtext}[2]%
{
  { \transparent{0.7}
  \begin{tikzpicture}[overlay, remember picture]
    \fill[white] ( #1 -| current page.north west) -- ++(0,1em) -- ++(\paperwidth,0) -- (#2 -| current page.north east)
     -- ++(0,-.5em) -- ++(-\paperwidth,0) -- cycle;
  \end{tikzpicture}
  }
}[

Irubataru

#include<primme/primme.h>
#include<armadillo>
#include<cassert>

constexpr auto SIZE = std::size_t {24};
using vec = arma::cx_vec::fixed<SIZE>;
using mat = arma::cx_mat::fixed<SIZE,SIZE>;

void matrix_multiplication(const vec &x, const mat &m, arma::cx_vec &y)
{

Irubataru

\documentclass{beamer}

\usetheme{metropolis}
\setbeamercolor{progress bar}{fg=green, bg=purple}

\begin{document}
\section{Section 1}

\begin{frame}{Hello}
\end{frame}