How to set the fixed width of columns? - latex

Question

Hello everyone I am creating a table on latex my code looks like this:
\begin{table}[H]
\centering
\caption{caption}
\label{my-label}
\begin{tabular}{lll}
\hline
\multicolumn{3}{|c|}{\cellcolor[HTML]{34CDF9}{\color[HTML]{000000} Matriz confusión Genero.}} \\ \hline
\multicolumn{1}{|l|}{} & \multicolumn{1}{l|}{M} & \multicolumn{1}{l|}{F} \\ \hline
\multicolumn{1}{|l|}{M} & \multicolumn{1}{l|}{43} & \multicolumn{1}{l|}{7} \\ \hline
\multicolumn{1}{|l|}{F} & \multicolumn{1}{l|}{11} & \multicolumn{1}{l|}{39} \\ \hline
\end{tabular}
\end{table}
It works well but the problem comes when I try to fix the width of the columns I tried:
\begin{tabular}{l{2cm}|l{2cm}|l{2cm}}
The result is the same table, with variable length of columns, I would like to fix the length of the columns, I would like to appreciate any suggestion to solve this problem.

Answer 1

Consider the following code:
\documentclass[a4paper]{article}
\usepackage{}
\begin{document}
\begin{table}%[H]
\centering
\caption{caption}
\label{my-label}
\begin{tabular}{|p{20mm}|p{15mm}|p{10mm}|}
\hline
% \multicolumn{3}{|c|}{\cellcolor[HTML]{34CDF9}{\color[HTML]{000000} Matriz confusión Genero.}} \\ \hline
\multicolumn{3}{|c|}{Matriz confusión Genero.} \\ \hline
& M & F \\ \hline
M & 43 & 7 \\ \hline
F & 11 & 39 \\ \hline
\end{tabular}
\end{table}
\end{document}
that outputs the following table:
You may be interested in particular in the line
\begin{tabular}{|p{20mm}|p{15mm}|p{10mm}|}
implementing paragraph alignment for the contents of a column of given width (here 20, 15 and 10 mm respectively).
To make it simpler, you should just get rid of all of those \multicolumn{1}{}{} and change
\begin{tabular}{l{2cm}|l{2cm}|l{2cm}}
to
\begin{tabular}{|p{2cm}|p{2cm}|p{2cm}|}