{"id":3674,"date":"2020-10-01T16:15:16","date_gmt":"2020-10-01T14:15:16","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=3674"},"modified":"2020-10-08T19:36:26","modified_gmt":"2020-10-08T17:36:26","slug":"latex-creer-un-alias-en-mode-mathematique","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2020\/10\/01\/latex-creer-un-alias-en-mode-mathematique\/","title":{"rendered":"LaTeX: cr\u00e9er un alias en mode math\u00e9matique"},"content":{"rendered":"\n<p>LaTex: cr\u00e9er un alias en mode math\u00e9matique peut s&#8217;av\u00e9rer utile d\u00e8s lors que l&#8217;on doive \u00e9crire une m\u00eame chose beaucoup de fois. Regardons comment faire&#8230;<\/p>\n\n\n\n<!--more-->\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Au menu sur cette page...<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.mathweb.fr\/euclide\/2020\/10\/01\/latex-creer-un-alias-en-mode-mathematique\/#Quest-ce_quun_alias_LaTeX_en_mode_mathematique\" >Qu&#8217;est-ce qu&#8217;un alias LaTeX en mode math\u00e9matique?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.mathweb.fr\/euclide\/2020\/10\/01\/latex-creer-un-alias-en-mode-mathematique\/#Une_solution_inspiree_de_celle_donnee_pour_creer_lalias_LaTeX_en_mode_mathematique\" >Une solution inspir\u00e9e de celle donn\u00e9e pour cr\u00e9er l&#8217;alias LaTeX en mode math\u00e9matique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mathweb.fr\/euclide\/2020\/10\/01\/latex-creer-un-alias-en-mode-mathematique\/#Un_contre-exemple\" >Un contre-exemple<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quest-ce_quun_alias_LaTeX_en_mode_mathematique\"><\/span>Qu&#8217;est-ce qu&#8217;un alias LaTeX en mode math\u00e9matique?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Un <em>alias<\/em> est une sorte de raccourci pour \u00e9crire quelque chose plus rapidement. Bien entendu, on a \u00e0 l&#8217;esprit les macros. Par exemple:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"latex\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"false\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\\newcommand{\\R}{\\mathbb{R}}<\/pre>\n\n\n\n<p>permet d&#8217;\u00e9crire l&#8217;ensemble des nombres r\u00e9els \\(\\mathbb{R}\\). Mais ce n&#8217;est pas ce que j&#8217;ai \u00e0 l&#8217;esprit.<\/p>\n\n\n\n<p>La solution \u00e0 laquelle je pense a \u00e9t\u00e9 propos\u00e9e sur ce <a href=\"https:\/\/www.mathematex.fr\/viewtopic.php?f=6&amp;t=17622\" target=\"_blank\" rel=\"noreferrer noopener\">fil de discussion<\/a>.<\/p>\n\n\n\n<p>Il s&#8217;agit en fait de pouvoir taper:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$5 * 3$<\/pre>\n\n\n\n<p>et voir appara\u00eetre:$$5 \\times 3.$$<\/p>\n\n\n\n<p>L&#8217;alias concerne donc ici le fait d&#8217;utiliser un symbole \u00e0 la place d&#8217;une macro (en l&#8217;occurrence, la macro <strong>\\times<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Une_solution_inspiree_de_celle_donnee_pour_creer_lalias_LaTeX_en_mode_mathematique\"><\/span>Une solution inspir\u00e9e de celle donn\u00e9e pour cr\u00e9er l&#8217;alias LaTeX en mode math\u00e9matique<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sans plus attendre, voici une solution pour cr\u00e9er un tel alias:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"latex\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\\documentclass{article}\n\\usepackage{amsmath,graphicx}\n\\def\\mathdef#1#{%\n\t\\mathcode`#1=\"8000\n\t\\begingroup \\lccode`~=`#1\\lowercase{\\endgroup\\def~}%\n}\n\\newcommand\\alias[2]{%\n\t\\mathdef #1{\\mathbin{#2}}\n}\n\\begin{document}\n\\alias{*}{\\text{\\scalebox{0.8}{$\\times$}}}\n\\alias{\/}{\\div}\n$2*3=6$\n\n$5\/8$\n\\end{document}<\/pre>\n\n\n\n<p>De la ligne 3 \u00e0 la ligne 6, ce n&#8217;est que du pur \\(\\TeX\\)&#8230; Langage plut\u00f4t compliqu\u00e9 \u00e0 appr\u00e9hender, mais qui ne fait pas peur \u00e0 <a href=\"https:\/\/www.mathweb.fr\/euclide\/2018\/09\/17\/des-packages-latex-made-in-france\/\" target=\"_blank\" rel=\"noreferrer noopener\">Christian Tellechea<\/a>, alias <em>un bon petit<\/em> sur le forum mathematex, \u00e0 l&#8217;origine de pas mal de packages utiles made in France, comme <em>xstrings<\/em> ou encore <em>scratch<\/em>.<\/p>\n\n\n\n<p>Autant \u00eatre honn\u00eate : je ne ma\u00eetrise pas du tout \\(\\TeX\\) ! J&#8217;ai juste ajout\u00e9 une macro \\(\\LaTeX\\) en ligne 7 pour plus de confort pour la suite (\u00e7a, \u00e7a va&#8230; c&#8217;est du \\(\\LaTeX\\)).<\/p>\n\n\n\n<p>Aux lignes 11 et 12, j&#8217;ai donc cr\u00e9\u00e9 deux alias:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>le premier pour remplacer le symbole &#8221; * &#8221; par la macro &#8221; \\times &#8221; tout en r\u00e9duisant le symbole \u00e0 80% de sa taille d&#8217;origine;<\/li><li>le second pour remplacer le symbole &#8221; \/ &#8221; par la macro &#8221; \\div &#8220;.<\/li><\/ul>\n\n\n\n<p>C&#8217;est assez pratique quand on veut taper rapidement des calculs (pour les enseignants en primaire par exemple).<\/p>\n\n\n\n<p>Cela dit, beaucoup d&#8217;\u00e9diteurs proposent l&#8217;auto-compl\u00e9tion. On aurait donc pu d\u00e9finir une macro tout simplement :<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"latex\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"false\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\\newcommand{\\timess}{\\text{\\scalebox{0.8}{$\\times$}}}<\/pre>\n\n\n\n<p>et demander \u00e0 notre \u00e9diteur de cr\u00e9er une auto-compl\u00e9tion sur cette nouvelle macro.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Un_contre-exemple\"><\/span>Un contre-exemple<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>L\u00e0 o\u00f9 \u00e7a devient prob\u00e9lmatique, c&#8217;est pour des trucs un peu plus \u00e9labor\u00e9s. Par exemple, quand je fais un chapitre sur les int\u00e9grales, je trouve assez p\u00e9nible, m\u00eame avec l&#8217;auto-compl\u00e9tion, d&#8217;\u00e9crire de multiples symboles d&#8217;int\u00e9gration, tous accompagn\u00e9s bien entendu du fameux d<em>x<\/em>, ou d<em>t<\/em>.<\/p>\n\n\n\n<p>C&#8217;est ainsi que le code suivant:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"latex\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\\alias{i}{\\displaystyle\\int}\n\\alias{d}{\\text{d}\\kern-2pt}\n\n$i_0^1f(x)dx$<\/pre>\n\n\n\n<p> donne:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"148\" height=\"88\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/10\/alias-latex.png\" alt=\"\" class=\"wp-image-3782\"\/><\/figure><\/div>\n\n\n\n<p>Comme on peut le constater, l&#8217;alias ne se comporte pas de la m\u00eame fa\u00e7on que pr\u00e9c\u00e9demment quand il s&#8217;agit d&#8217;op\u00e9rateurs.<\/p>\n\n\n\n<p>Il vaudra mieux alors s&#8217;orienter vers la d\u00e9finition d&#8217;une macro, comme par exemple:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"latex\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\\newcommand{\\intt}[4]{\\displaystyle\\int_{#1}^{#2}#3\\;\\text{d}#4}\n$\\intt{a}{b}{f(x)}{x}$<\/pre>\n\n\n\n<p>qui donne:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"142\" height=\"93\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/10\/alias-latex-1.png\" alt=\"\" class=\"wp-image-3784\"\/><\/figure><\/div>\n\n\n\n<p>C&#8217;est assur\u00e9ment plus contraignant, mais bien moins probl\u00e9matique.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LaTex: cr\u00e9er un alias en mode math\u00e9matique peut s&#8217;av\u00e9rer utile d\u00e8s lors que l&#8217;on doive \u00e9crire une m\u00eame chose beaucoup de fois. Regardons comment faire&#8230;<\/p>\n","protected":false},"author":1,"featured_media":3683,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3674","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-latex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LaTeX: cr\u00e9er un alias en mode math\u00e9matique - Mathweb.fr<\/title>\n<meta name=\"description\" content=\"LaTex: cr\u00e9er un alias en mode math\u00e9matique peut s&#039;av\u00e9rer utile d\u00e8s lors que l&#039;on doive \u00e9crire une m\u00eame chose beaucoup de fois. 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