main.tex

\documentclass{article}
  \usepackage[utf8]{inputenc}
  \usepackage{xcolor}
  \usepackage{amsmath}
  \usepackage{graphicx}
  \usepackage{subcaption}
  \usepackage{float}
  \usepackage{xargs}
  \usepackage{algorithmic}
  \usepackage{amsfonts}
  
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  \newcommand{\warn}[1]{\colorbox{yellow}{#1}}
  \newcommandx*\pic[4][4=default]{
    \begin{figure}[H]
      \centering
      \includegraphics[{#1}]{{#2}}
      \caption{{#3}}
      \label{#4}
    \end{figure}
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\newcommandx*{\picsPreview}[6][6=default]{
\begin{figure}[H]
	\centering
    \begin{subfigure}[b]{0.5\textwidth}
            \includegraphics[width=\textwidth]{#1}
            \caption{#2}
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            \caption{#4}
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    \caption{#5}
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}
  
  \title{Latvijas Universitāte}
  \author{Karina Pilusonoka}
  \date{September 2018}
  
  \begin{document}
  
  \maketitle
  \tableofcontents

  \include{datoru_tikli}
  \include{varbutiski_algoritmi}
  \include{atrie_algoritmi}
  \include{skaitlu_teorija}
  \include{data_processing}
  

  % \pic{width=7cm}{src}{Caption}
  % \picsPreview
  % {img/svd_vect/ab_mod.png}{трехмерная поверхность}
  % {img/svd_vect/ab_mod_marg.png}{линии уровня}
  % {$\tilde{F}(a,b) = |100 - (ab)|$ на интервале $a \in [-17, 17]$ и $b \in [-17,
  % 17]$.}
  \end{document}