Différences

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

--- generalites:erreurs:command_already_defined [2020/12/12 17:19] – Guillemets en chevrons dbitouze
+++ generalites:erreurs:command_already_defined [2021/01/12 23:29] (Version actuelle) – Suppression après fusion avec "generalites/erreurs/c/command_already_defined". jejust
@@ Ligne 1: / Ligne 1: @@
-====== Package reports « command already defined » ======
-You load a pair of packages, and the second reports that one of the
-commands it defines is already present.  For example, both the
-[[ctanpkg>txfonts|txfonts]] and [[ctanpkg>amsmath|amsmath]] define a command ''\iint''
-(and ''\iiint'' and so on); so
-<code latex>
-...
-\usepackage{txfonts}
-\usepackage{amsmath}
-</code>
-produces a string of error messages of the form:
-<code latex>
-! LaTeX Error: Command \iint already defined.
-               Or name \end... illegal, see p.192 of the manual.
-</code>
-As a general rule, things that [[ctanpkg>amsmath|amsmath]] defines, it defines
-well; however, there is a good case for using the [[ctanpkg>txfonts|txfonts]]
-version of ''\iint'' --- the associated ''tx'' fonts have a
-double integral symbol that doesn't need to be "faked" in the way
-[[ctanpkg>amsmath|amsmath]] does.  In the case that you are loading several
-symbol packages, every one of which defines the same symbol, you are
-likely to experience the problem in a big way (''\euro'' is a common
-victim).
-There are similar cases where one package redefines another's command,
-but no error occurs because the redefining package doesn't use
-''\newcommand''.  Often, in such a case, you only notice the change
-because you assume the definition given by the first package.  The
-[[ctanpkg>amsmath|amsmath]]--[[ctanpkg>txfonts|txfonts]] packages are just such a pair;
-[[ctanpkg>txfonts|txfonts]] doesn't provoke errors.
-You may deal with the problem by saving and restoring the command.
-Macro programmers may care to do this for themselves; for the rest of
-us, there's the package [[ctanpkg>savesym|savesym]].  The sequence:
-<code latex>
-\usepackage{savesym}
-\usepackage{amsmath}
-\savesymbol{iint}
-\usepackage{txfonts}
-\restoresymbol{TXF}{iint}
-</code>
-does the job; restoring the [[ctanpkg>amsmath|amsmath]] version of the command,
-and making the [[ctanpkg>txfonts|txfonts]] version of the command available as
-''\TXFiint''.
-Documentation of [[ctanpkg>savesym|savesym]] doesn't amount to much: the only
-commands are ''\savesymbol'' and ''\restoresymbol'', as noted above.
------
-//Source:// [[faquk>FAQ-alreadydef|Package reports "command already defined"]]
-{{htmlmetatags>metatag-keywords=(LaTeX,errors)
-metatag-og:title=(Package reports "command already defined")
-metatag-og:site_name=(FAQ LaTeX francophone)
-}}