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pgfplotstable 表在内部是如何存储的？

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pgfplotstable 表在内部是如何存储的？

我正在编写一些lua代码，将保存的表输出到文件，然后由 读取\pgfplotstableread{myfile.dat}\mytable。我想避免两个步骤：保存到文件和用 读取。所以，我的选择是直接在侧面\pgfplotstableread“写入” 。但我不知道 内部如何存储表格。我做了一些实验：\mytableluapgfplotstable

\documentclass{article}
\usepackage{pgfplotstable}

\pgfplotstableread[col sep=comma]{
Name, Age, stDev
Adam, 15, 3
Eve, 12, 1
}\mytable

\begin{document}

\show\mytable

\end{document}

其结果是：

> \mytable=macro:
->\pgfpl@@ {Name}\pgfpl@@ {Age}\pgfpl@@ {stDev}.

所以我猜其他行存储在其他宏中。我的问题是如何存储的？

答案1

根据pgfplotstableshared.code.tex（第 31-53 行）中的评论

% This file provides a high-level table manipulation and typesetting
% package.
%
%
% ---------------------------------------------
%  Implementation notes for programmers:
% ---------------------------------------------
%
%  The table data structure consists of
%  1. A name which must be a valid TeX macro like '\table'
%  2. A column list in the \pgfplotslist format.
%   In fact, the column list is stored in the table's name:
%     \pgfplotslistnewempty\table
%  3. A "file name" stored in
%     \csname\string<\namemacro>@@table@name\endcsname
%  4. A "scan line length" number stored in
%         \csname\string<\namemacro>@@table@scanline\endcsname
%         It contains the value of \pgfplotsscanlinelength which has
%         been identified right after \pgfplotstableread.
%  5. foreach column, there is a list of row-values (a row-vector) in
%  the \pgfplotslist format named
%         \csname\string<\namemacro>@<column name>\endcsname
%

我们可以编写以下测试

\documentclass{article}
\usepackage{pgfplotstable}
\pgfplotstableread[col sep=comma]{
Name, Age, stDev
Adam, 15, 3
Eve, 12, 1
}\mytable

\begin{document}
\begin{itemize}\makeatletter\ttfamily

\item[2] \string\mytable \\
\meaning\mytable

\item[3] file name \\
\expandafter\meaning\csname\string\mytable @@table@name\endcsname

\item[4] scan line length \\
\expandafter\meaning\csname\string\mytable @@table@scanline\endcsname

\item[5] column Name \\
\expandafter\meaning\csname\string\mytable @Name\endcsname

\item[5] column Age \\
\expandafter\meaning\csname\string\mytable @Age\endcsname

\item[5] column stDev \\
\expandafter\meaning\csname\string\mytable @stDev\endcsname

\end{itemize}
\end{document}

这给了我们

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