> For the complete documentation index, see [llms.txt](https://ayakaleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ayakaleaf-pro.ayaka.space/latex/zh-cn/latex-cuo-wu/07-extra-alignment-tab-has-been-changed-to-cr.md). # 多余的对齐制表符已更改为 \cr 当 LaTeX 在排版表格并检测到一个对齐字符（`&`）而它并未预期出现时，就会发生此错误。LaTeX 使用对齐字符来分隔表格列，并会 [报错](#a-short-note-on-the-cr-command) 如果表格尝试使用比预期更多的列。 ## 由 tabular 环境引起的错误 tabular 环境是此错误的常见来源，如下一个示例所示。这里，我们写了 `{c|c|c}` 来指定一个包含三列（居中列）的表格，这意味着每一行都应包含三个单元格。 ```latex \begin{tabular}{c|c|c} % Specify 3 centered columns 1 & 2 & 3 & 4\\ % ERROR: Uses 4 columns, not 3 5 & 6 & 7\\ \end{tabular} ``` [打开此 **会产生错误的** Overleaf 中的示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=Example+of+a+tabular+with+too+many+alignment+characters\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cbegin%7Bdocument%7D%0A%5Cbegin%7Btabular%7D%7Bc%7Cc%7Cc%7D+%25+Specify+3+centered+columns%0A+++1+%26+2+%26+3+%26+4%5C%5C+%25+ERROR%3A+Uses+4+columns%2C+not+3%0A+++5+%26+6+%26+7%5C%5C%0A%5Cend%7Btabular%7D%0A%5Cend%7Bdocument%7D) 我们的示例会生成以下错误消息： ![演示 LaTeX 表格错误 “Extra alignment tab has been changed to \cr”](/files/a5e28d3370e94aea11e8e1a4ac224cb13ff1a548) 并排版出这个表格： ![](/files/89a6c49f88a092c1700d9cc4c801102260507784) ### 错误说明 第一个 `&` 在表格行中 *第二次* 表示……列的开始；因此，对于一个三列表格，LaTeX 期望在每个换行符（ *路径元素：* ）之前看到`\\`对齐字符。然而，我们表格的第一行使用了 *三* 个对齐字符，这让 LaTeX 感到困惑，于是它将这个意外的对齐字符改为 [`\cr` 命令](#a-short-note-on-the-cr-command)——试图将列数减少到三列。请注意，使用 *三* 个对齐字符需要 *四* 列。 ### 如何修复该错误 要解决此错误并修复我们的表格，我们可以： * 通过删除条目来移除多余的列 * 在 tabular 环境选项中添加一个额外的列（例如，写成 `{c|c|c|c}`) * 创建一个新行（新表格行） 下面是演示这些解决方案的示例： ```latex \section*{Removing the extra column entry} \begin{center} \begin{tabular}{c|c|c} 1 & 2 & 3\\ 5 & 6 & 7\\ \end{tabular} \end{center} \section*{Adding an extra column to the tabular} \begin{center} \begin{tabular}{c|c|c|c} 1 & 2 & 3 & 4\\ 5 & 6 & 7\\ \end{tabular} \end{center} \section*{Creating a new line (new table row)} \begin{center} \begin{tabular}{c|c|c} 1 & 2 & 3 \\ 4 & & \\ 5 & 6 & 7 \\ \end{tabular} \end{center} ``` [在 Overleaf 中打开此示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=Options+for+correcting+a+tablular+error\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cbegin%7Bdocument%7D%0A%5Csection%2A%7BRemoving+the+extra+column+entry%7D%0A%0A%5Cbegin%7Bcenter%7D%0A%5Cbegin%7Btabular%7D%7Bc%7Cc%7Cc%7D%0A+++1+%26+2+%26+3%5C%5C%0A+++5+%26+6+%26+7%5C%5C%0A%5Cend%7Btabular%7D%0A%5Cend%7Bcenter%7D%0A%0A%5Csection%2A%7BAdding+an+extra+column+to+the+tabular%7D%0A%0A%5Cbegin%7Bcenter%7D%0A%5Cbegin%7Btabular%7D%7Bc%7Cc%7Cc%7Cc%7D%0A+++1+%26+2+%26+3+%26+4%5C%5C%0A+++5+%26+6+%26+7%5C%5C%0A%5Cend%7Btabular%7D%0A%5Cend%7Bcenter%7D%0A%0A%5Csection%2A%7BCreating+a+new+line+%28new+table+row%29%7D%0A%0A%5Cbegin%7Bcenter%7D%0A%5Cbegin%7Btabular%7D%7Bc%7Cc%7Cc%7D%0A+++1+%26+2+%26+3+%5C%5C%0A+++4+%26+++%26+++%5C%5C%0A+++5+%26+6+%26+7+%5C%5C%0A%5Cend%7Btabular%7D%0A%5Cend%7Bcenter%7D%0A%5Cend%7Bdocument%7D) 此示例生成如下输出： ![修复 tabular 错误](/files/56d73d0420b821ddfdd834f6915e0228f1d91e26) ## 由数学环境引起的错误 数学排版通常需要对数学元素进行对齐，这可以通过诸如 `array`, `矩阵`等环境来实现。由于某些数学环境使用表格来完成对齐，因此它们可能会触发“extra alignment tab”错误，如下面的示例所示。 ### array 环境 如果 array 行中使用的对齐制表符数量超过了 array 列数，LaTeX 就会生成错误。下面是一个使用三列 array，但第一行尝试使用四列的示例： ```latex \[ \begin{array}{lcl} g(x) & = & (x+2)^2 & = (x+2)(x+2)\\ % This row triggers the error & = & x^2+4x+4\\ \end{array} \] ``` [打开此 **会产生错误的** Overleaf 中的示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=An+array+with+too+many+alignment+characters\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cbegin%7Bdocument%7D%0A%5C%5B%0A%5Cbegin%7Barray%7D%7Blcl%7D%0Ag%28x%29+%26+%3D+%26+%28x%2B2%29%5E2+%26+%3D+%28x%2B2%29%28x%2B2%29%5C%5C+%25+This+row+triggers+the+error%0A%26+%3D+%26+x%5E2%2B4x%2B4%5C%5C%0A%5Cend%7Barray%7D%0A%5C%5D%0A%5Cend%7Bdocument%7D) 此示例会生成以下错误消息： ![显示由于制表符过多而导致的 LaTeX array 错误的图像](/files/32ca9a49b465d59a74de6052e241b91cce70be3a) 并排版出这个 array： $$\begin{array}{lcl} g(x) & = & (x+2)^2 \ =(x+2)(x+2) \ & = & x^2+4x+4\ \end{array}$$ 要更正此错误，请将 array 重写如下： ```latex \[ \begin{array}{lcl} g(x) & = & (x+2)^2 \\ & = & (x+2)(x+2) \\ & = & x^2+4x+4\\ \end{array} \] ``` [打开此 **已更正** Overleaf 中的示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=Corrected+version+of+the+array+example\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cbegin%7Bdocument%7D%0A%5C%5B%0A%5Cbegin%7Barray%7D%7Blcl%7D%0Ag%28x%29+%26+%3D+%26+%28x%2B2%29%5E2+%5C%5C%0A%26+%3D+%26+%28x%2B2%29%28x%2B2%29+%5C%5C%0A%26+%3D+%26+x%5E2%2B4x%2B4%5C%5C%0A%5Cend%7Barray%7D%0A%5C%5D%0A%5Cend%7Bdocument%7D) 更正后的 array 会生成如下结果： $$\begin{array}{lcl} g(x) & = & (x+2)^2 \ & = & (x+2)(x+2) \ & = & x^2+4x+4\ \end{array}$$ ### amsmath 的矩阵环境 该 `amsmath` package 提供了许多用于排版矩阵的环境，包括 `矩阵`, `pmatrix`, `bmatrix`, `Bmatrix`, `vmatrix`，以及 `Vmatrix`. 下面的 `pmatrix` 示例尝试使用 12 列，但会生成错误，因为 `amsmath` 在排版矩阵中设置了默认的最大 10 列。 ```latex \documentclass{article} \usepackage{amsmath} % To access the matrix environment \begin{document} \[ \begin{pmatrix} a_{1,1} & a_{1,2} & a_{1,3} & a_{1,4} & a_{1,5} & a_{1,6} & a_{1,7} & a_{1,8} & a_{1,9} & a_{1,10} & a_{1,11} & a_{1,12} \\ \end{pmatrix} \] \end{document} ``` [打开此 **会产生错误的** Overleaf 中的示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=A+pmatrix+with+too+many+columns\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cusepackage%7Bamsmath%7D+%25+To+access+the+matrix+environment%0A%5Cbegin%7Bdocument%7D%0A%5C%5B%0A%5Cbegin%7Bpmatrix%7D%0Aa_%7B1%2C1%7D+%26+a_%7B1%2C2%7D+%26+a_%7B1%2C3%7D+%26+a_%7B1%2C4%7D+%26+a_%7B1%2C5%7D+%26+a_%7B1%2C6%7D+%26+a_%7B1%2C7%7D+%26+a_%7B1%2C8%7D+%26+a_%7B1%2C9%7D+%26+a_%7B1%2C10%7D+%26+a_%7B1%2C11%7D+%26+a_%7B1%2C12%7D+%5C%5C%0A%5Cend%7Bpmatrix%7D%0A%5C%5D%0A%5Cend%7Bdocument%7D) 要修复该错误，请将列最大值改为 12，写作 `\setcounter{MaxMatrixCols}{12}`，或您选择的任何值。 ```latex \documentclass{article} \usepackage{amsmath} % To access the pmatrix environment \setcounter{MaxMatrixCols}{12} \begin{document} \[ \begin{pmatrix} a_{1,1} & a_{1,2} & a_{1,3} & a_{1,4} & a_{1,5} & a_{1,6} & a_{1,7} & a_{1,8} & a_{1,9} & a_{1,10} & a_{1,11} & a_{1,12} \\ \end{pmatrix} \] \end{document} ``` [打开此 **已更正** Overleaf 中的示例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=A+pmatrix+with+12+columns\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Cusepackage%7Bamsmath%7D+%25+To+access+the+pmatrix+environment%0A%5Csetcounter%7BMaxMatrixCols%7D%7B12%7D%0A%5Cbegin%7Bdocument%7D%0A%5C%5B%0A%5Cbegin%7Bpmatrix%7D%0Aa_%7B1%2C1%7D+%26+a_%7B1%2C2%7D+%26+a_%7B1%2C3%7D+%26+a_%7B1%2C4%7D+%26+a_%7B1%2C5%7D+%26+a_%7B1%2C6%7D+%26+a_%7B1%2C7%7D+%26+a_%7B1%2C8%7D+%26+a_%7B1%2C9%7D+%26+a_%7B1%2C10%7D+%26+a_%7B1%2C11%7D+%26+a_%7B1%2C12%7D+%5C%5C%0A%5Cend%7Bpmatrix%7D%0A%5C%5D%0A%5Cend%7Bdocument%7D) 更正后的示例会生成如下矩阵： $$\begin{pmatrix} a\_{1,1} & a\_{1,2} & a\_{1,3} & a\_{1,4} & a\_{1,5} & a\_{1,6} & a\_{1,7} & a\_{1,8} & a\_{1,9} & a\_{1,10} & a\_{1,11} & a\_{1,12} \ \end{pmatrix}$$ ## 关于 \cr 命令的简短说明 LaTeX 通过将意外的对齐字符替换为一个名为 `\cr`的基本命令来处理该问题，而该命令是 LaTeX 内部机制中用于结束表格行的核心部分。虽然用户使用 LaTeX `\\` 宏来表示表格行的结束，但实际上执行的是 `\cr` 命令，它会在 `\\` 宏被处理时在后台终止该行。 --- # Agent Instructions This documentation is published with GitBook. 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