How can I make a two column table?

Question

I want to make a two column table whose column titles are Hyperparameter and Optimal Value.

I wrote this code:

\begin{table}[H]
  \begin{center}
    \caption{More columns.}
    \label{tab:table1}
    \begin{tabular}{|c|c|}
      \textbf{Hyperparameter} & \textbf{Optimal Value}\\
      \hline
      base_estimator__C & 1.0 \\ 
      base_estimator__decision_function_shape & ovo\\ 
      base_estimator__kernel & Linear\\ 
    \end{tabular}
  \end{center}
\end{table}

It doesn't work, giving multiple errors.

add a backslash \ before the underscore and add package \usepackage[T1]{fontenc} -- also suggest use booktabs package and use toprule, midrule, bottomrule for better spacing as in the answer below -- also suggest remove vertical lines — js bibra, Mar 16 '21 at 10:52
I removed the tabularx tag since you don't use this package in your code. Ragarding the error messags you should get upon trying to compile your code, you might want to take a look at: https://tex.stackexchange.com/a/554241/134144 — leandriis, Mar 17 '21 at 08:54

score 2 · Answer 1 · answered Mar 17 '21 at 09:02

Here are two alternative examples:

\documentclass[10pt,a4paper]{article}
\usepackage{caption}
\usepackage{booktabs}
\usepackage{collcell}
\newcommand{\myverbatim}[1]{\ttfamily\detokenize{#1}}
\begin{document}
    \begin{table}
        \centering
            \caption{More columns.}
            \label{tab:table1}
            \begin{tabular}{>{\collectcell\myverbatim}l<{\endcollectcell}c}\toprule
                \multicolumn{1}{l}{\textbf{Hyperparameter}} & \textbf{Optimal Value}\
                \midrule
                base_estimator_C & 1.0 \ 
                base_estimator_decision_function_shape & ovo\ 
                base_estimator_kernel & Linear\ 
                \bottomrule
            \end{tabular}
    \end{table}
\end{document}

\documentclass[10pt,a4paper]{article}
\usepackage{caption}
\usepackage{booktabs}
\usepackage{underscore}
\begin{document}
    \begin{table}
        \centering
            \caption{More columns.}
            \label{tab:table1}
            \begin{tabular}{lc}\toprule
                \textbf{Hyperparameter} & \textbf{Optimal Value}\
                \midrule
                base_estimator_C & 1.0 \ 
                base_estimator_decision_function_shape & ovo\ 
                base_estimator_kernel & Linear\ 
                \bottomrule
            \end{tabular}
    \end{table}
\end{document}

js bibra · Accepted Answer · 2021-03-16T10:55:59.697

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage[left=2.00cm, right=1.00cm]{geometry}
\begin{document}
    \begin{table}
        \begin{center}
            \caption{More columns.}
            \label{tab:table1}
            \begin{tabular}{|c|c|}
                \textbf{Hyperparameter} & \textbf{Optimal Value}\\
                \hline
                base\_estimator\_C & 1.0 \\ 
                base\_estimator\_decision\_function\_shape & ovo\\ 
                base\_estimator\_kernel & Linear\\ 
            \end{tabular}
        \end{center}
    \end{table}
\end{document}

edit

\documentclass[10pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{booktabs}
\begin{document}
    \begin{table}
        \begin{center}
            \caption{More columns.}
            \label{tab:table1}
            \begin{tabular}{cc}\toprule
                \textbf{Hyperparameter} & \textbf{Optimal Value}\\
                \midrule
                base\_estimator\_C & 1.0 \\ 
                base\_estimator\_decision\_function\_shape & ovo\\ 
                base\_estimator\_kernel & Linear\\ 
                \bottomrule
            \end{tabular}
        \end{center}
    \end{table}
\end{document}

How can I make a two column table?

2 Answers2