pgfplotstable - 创建一个额外的计算列

Question

如何在输出中获得第三列“Z”，其中的值为 x*y

\documentclass{article}
\usepackage{pgfplots, pgfplotstable}
\usepackage{filecontents}
\usepackage{booktabs}

\begin{filecontents*}{data.dat}
x y
1 2
2 3
3 4
4 5
\end{filecontents*}

\pgfplotstableset{% global config, for example in the preamble
  every last row/.style={after row=\bottomrule},
}

\begin{document}
\pgfplotstabletypeset[every head row/.style={before row={
        \toprule},
                                        after row=\midrule},
    columns/x/.style={column name=x},
    columns/y/.style={column name=y},
  ]{data.dat}
\end{document}

我希望它看起来是这样的：

Answer 1

参见第 4.3.2 段pgfplotstable 手册。

\documentclass{article}
\usepackage{pgfplots, pgfplotstable}
\usepackage{filecontents}
\usepackage{booktabs}

\begin{filecontents*}{data.dat}
x y
1 2
2 3
3 4
4 5
\end{filecontents*}

\pgfplotstableset{% global config, for example in the preamble
  every last row/.style={after row=\bottomrule},
  create on use/z/.style={
      create col/expr={\thisrow{x}*\thisrow{y}}}
}

\begin{document}
\pgfplotstabletypeset[
    every head row/.style={before row=\toprule,after row=\midrule},
    columns={x,y,z},
    columns/x/.style={column name=x},
    columns/y/.style={column name=y},
    columns/z/.style={column name=z},
  ]{data.dat}
\end{document}