{"id":6645,"date":"2025-07-15T13:34:48","date_gmt":"2025-07-15T13:34:48","guid":{"rendered":"https:\/\/functiontranslator.com\/log\/"},"modified":"2021-02-26T08:09:46","modified_gmt":"2021-02-26T08:09:46","slug":"log","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/fr\/log\/","title":{"rendered":"LOG"},"content":{"rendered":"<h2>Introduction \u00e0 la fonction de logarithme<\/h2>\n<p>La fonction de logarithme, souvent abr\u00e9g\u00e9e en &lsquo;LOG&rsquo;, joue un r\u00f4le crucial en math\u00e9matiques et est largement utilis\u00e9e dans diverses applications informatiques, y compris Microsoft Excel et Google Sheets. Cette fonction permet de calculer le logarithme d&rsquo;un nombre donn\u00e9 en sp\u00e9cifiant souvent une base d\u00e9termin\u00e9e pour le calcul.<\/p>\n<h2>Description du Syntaxe<\/h2>\n<p>La syntaxe de la fonction LOG pr\u00e9sente quelques variations entre Excel et Google Sheets, tout en conservant une structure fondamentalement similaire.<\/p>\n<h3>Microsoft Excel:<\/h3>\n<pre><code>LOG(nombre; base)<\/code><\/pre>\n<ul>\n<li><strong>nombre<\/strong> : Le nombre dont vous souhaitez calculer le logarithme. Il doit \u00eatre un nombre positif.<\/li>\n<li><strong>base<\/strong> : La base du logarithme. Si non sp\u00e9cifi\u00e9e, le logarithme naturel (base e) est utilis\u00e9 par d\u00e9faut.<\/li>\n<\/ul>\n<h3>Google Sheets:<\/h3>\n<pre><code>LOG(nombre, base)<\/code><\/pre>\n<p>Dans Google Sheets, une virgule est utilis\u00e9e comme s\u00e9parateur de param\u00e8tres, contrairement au point-virgule dans Excel. Les param\u00e8tres conservent les m\u00eames significations qu&rsquo;en Excel.<\/p>\n<h2>Exemple pratique d\u2019utilisation<\/h2>\n<p>Voici des exemples illustrant l&rsquo;utilisation concr\u00e8te de cette fonction.<\/p>\n<h3>Exemple 1: Calcul du logarithme d\u00e9cimal<\/h3>\n<p>Pour calculer le logarithme d\u00e9cimal (base 10) du nombre 100 :<\/p>\n<pre><code>=LOG(100; 10)<\/code><\/pre>\n<p>Cette formule renvoie 2, car 10^2 = 100.<\/p>\n<h3>Exemple 2: Utilisation en finance pour calculer les taux de croissance<\/h3>\n<p>Les logarithmes sont couramment utilis\u00e9s pour calculer les taux de croissance compos\u00e9s dans le domaine financier. Imaginons que vous souhaitez d\u00e9terminer le taux de croissance annuel compos\u00e9 (CAGR) d&rsquo;un investissement passant de 1,000\u20ac \u00e0 10,000\u20ac en 10 ans.<\/p>\n<pre><code>=EXP(LOG(10000\/1000)\/10) - 1<\/code><\/pre>\n<p>Cette formule utilise LOG pour obtenir le logarithme naturel de la croissance totale de l&rsquo;investissement, que nous divisons ensuite par la p\u00e9riode d&rsquo;investissement (10 ans), avant d&rsquo;appliquer la fonction EXP pour calculer le taux de croissance annuel et de soustraire 1 pour obtenir le taux en pourcentage.<\/p>\n<p>Le r\u00e9sultat fournit ainsi le taux de croissance annuel compos\u00e9.<\/p>\n<h2>Conclusion<\/h2>\n<p>Indispensable pour une vari\u00e9t\u00e9 de calculs scientifiques, math\u00e9matiques et financiers, la fonction LOG est un outil puissant dans Excel ou Google Sheets. Sa ma\u00eetrise permet d&rsquo;analyser et d&rsquo;interpr\u00e9ter des donn\u00e9es complexes de mani\u00e8re efficace, enrichissant ainsi vos comp\u00e9tences en analyse de donn\u00e9es.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Renvoie le logaRithme d\u2019un nombRe dans la base sp\u00e9cifi\u00e9e<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[310],"tags":[],"class_list":["post-6645","post","type-post","status-publish","format-standard","hentry","category-mathematiques-et-trigonometrie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fonction LOG dans Excel : comment \u00e7a marche, exemples et syntaxe<\/title>\n<meta name=\"description\" content=\"Pr\u00e9sentation de la fonction LOG d\u2019Excel et Google Sheets. 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