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4_domaines_specialises:mathematiques:arguments_contre_eqnarray2 [2018/07/07 22:49]
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 The user is far better served by the
-[`amsmath`](https://​ctan.org/​pkg/​amsmathpackage, which +[[ctanpkg>​amsmath|amsmath]] package, which 
-provides an `alignenvironment,​ which is designed with+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 [`amsmath`](https://​ctan.org/​pkg/​amsmath)+other [[ctanpkg>​amsmath|amsmath]]
 alignment environments are capable of far greater 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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