Différences

Ci-dessous, les différences entre deux révisions de la page.

--- generalites:erreurs:alignment_tab_changed_to_cr [2020/12/12 17:17] – Backquotes remplacés par des doubles apostrophes dbitouze
+++ generalites:erreurs:alignment_tab_changed_to_cr [2021/01/10 16:22] (Version actuelle) – Suppression après fusion avec "generalites/erreurs/e/extra_alignment_tab_has_been_changed_to_cr". jejust
@@ Ligne 1: / Ligne 1: @@
-====== Alignment tab changed to ''\cr'' ======
-This is an error you may encounter in LaTeX when a tabular
-environment is being processed.  "Alignment tabs" are the
-''&'' signs that separate the columns of a ''tabular''
-(or ''array'' or matrix) environment; so the error message
-<code latex>
-! Extra alignment tab has been changed to \cr
-</code>
-could arise from a simple typo, such as:
-<code latex>
-\begin{tabular}{ll}
-  hello   & there & jim \\
-  goodbye & now
-\end{tabular}
-</code>
-where the second ''&'' in the first line of the table is more than the
-two-column ''ll'' column specification can cope with. In this
-case, an extra ''l'' in that solves the problem.  (If you
-continue from the error in this case, ''jim'' will be moved
-to a row of his own.)  Another simple typo that can provoke the error
-is:
-<code latex>
-\begin{tabular}{ll}
-  hello   & there
-  goodbye & now
-\end{tabular}
-</code>
-where the ''\\'' has been missed from the first line of the table.
-In this case, if you continue from the error, you will find that
-LaTeX has made a table equivalent to:
-<code latex>
-\begin{tabular}{ll}
-  hello   & there goodbye\\
-  now
-\end{tabular}
-</code>
-(with the second line of the table having only one cell).
-Rather more difficult to spot is the occurrence of the error when
-you're using alignment instructions in a ''p'' column:
-<code latex>
-\usepackage{array}
-...
-\begin{tabular}{l>{\raggedright}p{2in}}
-here & we are again \\
-happy & as can be
-\end{tabular}
-</code>
-the problem here (as explained in
-[[FAQ-tabcellalign|tabular cell alignment]]) is that the
-''\raggedright'' command in the column specification has overwritten
-''tabular''s definition of ''\\'', so that
-''happy'' appears in a new line of the second column, and the
-following ''&'' appears to LaTeX just like the second
-''&'' in the first example above.
-Get rid of the error in the way described in
-[[FAQ-tabcellalign|tabular cell alignment]] --- either use
-''\tabularnewline'' explicitly, or use the ''\RBS'' trick described
-there.
-The [[ctanpkg>amsmath|amsmath]] package adds a further twist; when typesetting
-a matrix (the package provides many matrix environments), it has a
-fixed maximum number of columns in a matrix --- exceed that maximum,
-and the error will appear.  By default, the maximum is set to 10, but
-the value is stored in counter ''MaxMatrixCols'' and may be
-changed (in the same way as any counter):
-<code latex>
-\setcounter{MaxMatrixCols}{20}
-</code>
------
-//Source:// [[faquk>FAQ-altabcr|Alignment tab changed to `\cr`]]
-{{htmlmetatags>metatag-keywords=(LaTeX,errors)
-metatag-og:title=(Alignment tab changed to `\cr`)
-metatag-og:site_name=(FAQ LaTeX francophone)
-}}