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4_domaines_specialises:mathematiques:arguments_contre_eqnarray2 [2018/06/03 15:35]
d.p.carlisle
4_domaines_specialises:mathematiques:arguments_contre_eqnarray2 [2020/11/16 08:48]
yannick.tanguy Suppression de la page reportée (et traduite) sur la page française.
Ligne 1: Ligne 1:
---- +====== ​Why not use `eqnarray`? ​======
-title: ​Why not use `eqnarray`? +
-category: usage +
-permalink: /​FAQ-eqnarray +
----+
  
-The environment ​`eqnarrayis attractive for the+ 
 +The environment ​''​eqnarray'' ​is attractive for the
 occasional user of mathematics in LaTeX documents: it seems to occasional user of mathematics in LaTeX documents: it seems to
-allow aligned systems of equations. ​ Indeed it _does_ ​supply such+allow aligned systems of equations. ​ Indeed it //​does// ​supply such
 things, but it makes a serious mess of spacing. ​ In the system: things, but it makes a serious mess of spacing. ​ In the system:
-```latex+ 
 +<​code ​latex>
 \begin{eqnarray} \begin{eqnarray}
   a & = & b + c \\   a & = & b + c \\
   x & = & y - z   x & = & y - z
 \end{eqnarray} \end{eqnarray}
-``` +</​code>​ 
-the spacing around the "​="​ signs is _not_ that defined in the +the spacing around the "​="​ signs is //​not// ​that defined in the 
-metrics for the font from which the glyph comes&​nbsp;&​mdash; ​it's +metrics for the font from which the glyph comes --- it's 
-`\arraycolsep`, which may be set to some very odd value for reasons+''​\arraycolsep''​, which may be set to some very odd value for reasons
 associated with real arrays elsewhere in the document. associated with real arrays elsewhere in the document.
  
-The user is far better served by the AMSLaTeX bundle, which +The user is far better served by the 
-provides an `alignenvironment,​ which is designed with+[[ctanpkg>​amsmath|amsmath]] package, which 
 +provides an ''​align'' ​environment,​ which is designed with
 the needs of mathematicians in mind (as opposed to the convenience of the needs of mathematicians in mind (as opposed to the convenience of
-LaTeX programmers). ​ For this simple case (`alignand +LaTeX programmers). ​ For this simple case (''​align'' ​and 
-other AMSLaTeX ​alignment environments are capable of far greater+other [[ctanpkg>​amsmath|amsmath]] 
 +alignment environments are capable of far greater
 things), code as: things), code as:
-```latex+ 
 +<​code ​latex>
 \begin{align} \begin{align}
   a & = b + c \\   a & = b + c \\
   x & = y - z   x & = y - z
 \end{align} \end{align}
-```+</​code>​
 The matter is discussed in more detail in a  The matter is discussed in more detail in a 
-[PracTeX journal paper](https://​tug.org/​pracjourn/​2006-4/​madsen/​madsen.pdf)+[[https://​tug.org/​pracjourn/​2006-4/​madsen/​madsen.pdf|PracTeX journal paper]]
 by Lars Madsen; Stefan Kottwitz offers a  by Lars Madsen; Stefan Kottwitz offers a 
-[TeX blog entry](http://​texblog.net/​latex-archive/​maths/​eqnarray-align-environment/​)+[[http://​texblog.net/​latex-archive/​maths/​eqnarray-align-environment/​|TeX blog entry]]
 which includes screen shots of the output, convincingly demonstrating which includes screen shots of the output, convincingly demonstrating
 the problem. the problem.
  
 +
 +-----
 +
 +//Source:// [[faquk>​FAQ-eqnarray|Why not use `eqnarray`?​]]
 +
 +{{htmlmetatags>​metatag-keywords=(LaTeX,​usage)
 +metatag-og:​title=(Why not use `eqnarray`?​)
 +metatag-og:​site_name=(FAQ LaTeX francophone)
 +}}
  
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