热图样式的表格，对行和列的子集进行着色

Question

我想构建一个“热图”样式表，如下问题所述： 使用 TikZ 绘制热图

其中一种方法可能是修改 Christian Feuersänger 编写的这段代码，该代码是那里接受的答案：http://pgfplots.net/tikz/examples/color-maps/

有没有一种简单的方法可以修改此代码以不为表格的第一列着色（因为这些通常是某种标签）或通常仅为单元格的子集着色？

Answer 1

要不对具有标题的列进行着色t，您可以添加

columns/t/.style={reset styles}

或者，对于非数字列：

columns/a/.style={reset styles,string type},

到 \pgfplotstabletypeset 选项。使用问题中链接的示例表格之一的完整示例：

\documentclass[varwidth=true,border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}
\usepackage{colortbl}
\usepackage{pgfplotstable}
\pgfplotstableset{
    /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 http://tex.stackexchange.com/questions/12668/
                \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}
\pgfplotstabletypeset[
    color cells={min=-300,max=800},
    col sep=comma,
    columns/a/.style={reset styles}
]{
    a,b,c,d
    50,-300,-200,-100
    -20,0,100,200
    5,300,40,800
    3,30,50,70
}

\end{document}