表格中的热图

Question

我想要一张表格中的热图，并在给定的链接上找到了解决方案 使用 TikZ 绘制热图。@ 发布的答案之一（页面上的最后一个答案）https://tex.stackexchange.com/users/7561/adn生成下表。

上表的代码是

\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{pgfplotstable}

\pgfplotstableset{
color cells/.style={
    col sep=comma,
    string type,
    postproc cell content/.code={%
            \pgfkeysalso{@cell content=\rule{0cm}{2.4ex}%
            \pgfmathsetmacro\y{min(100,max(0,abs(round(##1 * 0.5))))}%
            \ifnum##1<0\edef\temp{\noexpand\cellcolor{blue!\y}}\temp\fi%
            \ifnum##1>0\edef\temp{\noexpand\cellcolor{red!\y}}\temp\fi%
            \pgfmathtruncatemacro\x\y%
            \ifnum\x>50 \color{white}\fi%
            ##1}%
            }
}
}
\begin{document}
\begin{table}\caption{Correlation or something}
\centering
\pgfplotstabletypeset[color cells]{
a,b,c,d
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}
\end{table}
\end{document}

现在我想将一个表逻辑地分成 6 个大小为 [4x4] 的子表，如下所示

我想要每个子表的热图，根据相应子表的最小值和最大值为每个子表的单元格着色。我希望现在问题更清楚了。

PS：我无法将其作为评论发布。因此将其作为单独的问题提出。

Answer 1

由于您希望根据子表的最高值和最低值为单元格着色，因此链接问题的第一个答案应该使用。

对于此解决方案，必须手动将表拆分为子表。这可能可以自动完成，但为此编写代码需要几天时间。但有一个优点，您可以colormap为每个子表单独设置使用。

此外，如果子表之间的列宽不同，则需要使用固定宽度列。

子表设置在表格中，注意要放在括号（{...}）中，否则会出现错误。

\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{pgfplotstable}
\usepgfplotslibrary{colormaps}

\usepackage[margin=3cm]{geometry}


\newcolumntype{C}{>{\centering\arraybackslash}p{8mm}} % centered fixed-width-column

% from https://tex.stackexchange.com/a/83865/110842
\pgfplotstableset{
    every column/.style={column type=C},
    col sep=comma,
    /pgfplots/colormap/autumn,
    /color cells/min/.initial=0,
    /color cells/max/.initial=1000,
    /color cells/textcolor/.initial=,
    %
    % Usage: 'color cells={min=<value which is mapped to lowest color>, 
    %   max = <value which is mapped to largest>}
    color cells/.code={%
        \pgfqkeys{/color cells}{#1}%
        \pgfkeysalso{%
            postproc cell content/.code={%
                %
                \begingroup
                %
                % acquire the value before any number printer changed
                % it:
                \pgfkeysgetvalue{/pgfplots/table/@preprocessed cell content}\value
                \ifx\value\empty
                    \endgroup
                \else
                \pgfmathfloatparsenumber{\value}%
                \pgfmathfloattofixed{\pgfmathresult}%
                \let\value=\pgfmathresult
                %
                % map that value:
                \pgfplotscolormapaccess
                    [\pgfkeysvalueof{/color cells/min}:\pgfkeysvalueof{/color cells/max}]
                    {\value}
                    {\pgfkeysvalueof{/pgfplots/colormap name}}%
                % now, \pgfmathresult contains {<R>,<G>,<B>}
                % 
                % acquire the value AFTER any preprocessor or
                % typesetter (like number printer) worked on it:
                \pgfkeysgetvalue{/pgfplots/table/@cell content}\typesetvalue
                \pgfkeysgetvalue{/color cells/textcolor}\textcolorvalue
                %
                % tex-expansion control
                % see https://tex.stackexchange.com/questions/12668/where-do-i-start-latex-programming/27589#27589
                \toks0=\expandafter{\typesetvalue}%
                \xdef\temp{%
                    \noexpand\pgfkeysalso{%
                        @cell content={%
                            \noexpand\cellcolor[rgb]{\pgfmathresult}%
                            \noexpand\definecolor{mapped color}{rgb}{\pgfmathresult}%
                            \ifx\textcolorvalue\empty
                            \else
                                \noexpand\color{\textcolorvalue}%
                            \fi
                            \the\toks0 %
                        }%
                    }%
                }%
                \endgroup
                \temp
                \fi
            }%
        }%
    }
}

\begin{document}
\begin{table}\caption{Correlation or something}
\centering
\begin{tabular}{c@{}c@{}c}
{\pgfplotstabletypeset[color cells={min=-300,max=800}]{
a,b,c,d
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}}
&
{\pgfplotstabletypeset[
    /pgfplots/colormap/spring, % set different colormap
    color cells={min=-300,max=800}]{
e,f,g,h
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}}
&
{\pgfplotstabletypeset[color cells={min=-30,max=80}]{
i,j,k,l
5,-30,-20,-10
-2,0,10,20
2,30,4,80
1,3,5,70
}}
\\
{\pgfplotstabletypeset[
    every head row/.style={output empty row},
    color cells={min=-300,max=800}]{
a,b,c,d
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}}
&
{\pgfplotstabletypeset[
    every head row/.style={output empty row},
    color cells={min=-300,max=800}]{
e,f,g,h
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}}
&
{\pgfplotstabletypeset[
    /pgfplots/colormap/winter, % set different colormap
    every head row/.style={output empty row},
    color cells={min=-300,max=800}]{
i,j,k,l
50,-300,-200,-100
-20,0,100,200
5,300,40,800
3,30,50,70
}}
\end{tabular}
\end{table}
\end{document}