{"id":6396,"date":"2025-07-15T13:34:48","date_gmt":"2025-07-15T13:34:48","guid":{"rendered":"https:\/\/functiontranslator.com\/atan2\/"},"modified":"2021-02-26T08:01:58","modified_gmt":"2021-02-26T08:01:58","slug":"atan2","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/fr\/atan2\/","title":{"rendered":"ATAN2"},"content":{"rendered":"<h2>Vue d&rsquo;ensemble<\/h2>\n<p> La fonction ATAN2 est utilis\u00e9e pour calculer l&rsquo;arc tangente du quotient de ses deux arguments. En d&rsquo;autres termes, elle d\u00e9termine l&rsquo;angle en radians entre l&rsquo;axe des abscisses positif et un point donn\u00e9 (y, x), ce qui est essentiel pour convertir des coordonn\u00e9es cart\u00e9siennes en coordonn\u00e9es polaires.<\/p>\n<h2>Syntaxe de la fonction<\/h2>\n<p> Dans Excel et Google Sheets, la syntaxe de la fonction ATAN2 pr\u00e9sente une diff\u00e9rence notable : <\/p>\n<ul>\n<li><strong>Excel<\/strong>: ATAN2(x_num, y_num)<\/li>\n<li><strong>Google Sheets<\/strong>: ATAN2(y_num, x_num)<\/li>\n<\/ul>\n<p> <strong>x_num<\/strong> : La coordonn\u00e9e X du point.<br \/> <strong>y_num<\/strong> : La coordonn\u00e9e Y du point. <\/p>\n<pre> <code> Exemple sous Excel: =ATAN2(4, 3) - Cela retourne 0.9273, qui est l'angle en radians entre l'axe positif des x et le point (3, 4). Exemple sous Google Sheets: =ATAN2(4, 3) - Ce calcul donnera le m\u00eame r\u00e9sultat que celui d'Excel mais avec les param\u00e8tres invers\u00e9s. <\/code> <\/pre>\n<h2>Applications pratiques de la fonction<\/h2>\n<p> La fonction ATAN2 est extr\u00eamement utile dans divers contextes, tels que :<\/p>\n<ul>\n<li>Le calcul de directions dans des syst\u00e8mes de navigation.<\/li>\n<li>La conversion de coordonn\u00e9es pour des syst\u00e8mes graphiques ou de simulation.<\/li>\n<\/ul>\n<h2>Exemple de calcul de direction<\/h2>\n<p> Imaginons un robot mobile capable de se d\u00e9placer dans toutes les directions sur un plan bidimensionnel, et vous souhaitez calculer la direction dans laquelle le robot doit se diriger pour atteindre un point sp\u00e9cifi\u00e9 depuis sa position actuelle.<\/p>\n<pre> <code> Position actuelle du robot (x1, y1) = (2, 3) Point cible (x2, y2) = (5, 7) Calcul sous Excel: =ATAN2(7 - 3, 5 - 2) - Ce calcul indique l'angle en radians vers lequel le robot doit se diriger. Calcul sous Google Sheets: =ATAN2(5 - 2, 7 - 3) - Les param\u00e8tres sont invers\u00e9s mais le r\u00e9sultat est identique. <\/code> <\/pre>\n<h2>Utilisation dans la cr\u00e9ation de graphiques<\/h2>\n<p> Un autre usage fr\u00e9quent est la cr\u00e9ation de graphiques d&rsquo;angle \u00e0 partir de coordonn\u00e9es cart\u00e9siennes, ce qui est crucial pour des analyses en sciences physiques ou en ing\u00e9nierie.<\/p>\n<pre> <code> Pour un ensemble de points, calculer l'angle de chaque point par rapport \u00e0 l'origine: Points = [(1, 2), (3, 5), (-1, -3)] Sous Excel: Angles = [ATAN2(2, 1), ATAN2(5, 3), ATAN2(-3, -1)] Sous Google Sheets: Angles = [ATAN2(1, 2), ATAN2(3, 5), ATAN2(-1, -3)] <\/code> <\/pre>\n<p> Ces exemples d\u00e9montrent l&rsquo;utilit\u00e9 de la fonction ATAN2 pour r\u00e9pondre \u00e0 des probl\u00e8mes complexes en math\u00e9matiques appliqu\u00e9es, navigation et visualisation de donn\u00e9es.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Renvoie l\u2019aRctangente des cooRdonn\u00e9es x et y<\/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-6396","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 ATAN2 dans Excel : comment \u00e7a marche, exemples et syntaxe<\/title>\n<meta name=\"description\" content=\"Pr\u00e9sentation de la fonction ATAN2 d\u2019Excel et Google Sheets. 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