{"id":7353,"date":"2022-03-03T14:40:39","date_gmt":"2022-03-03T13:40:39","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?page_id=7353"},"modified":"2023-04-16T16:20:20","modified_gmt":"2023-04-16T14:20:20","slug":"nuage-de-points-dune-suite-numerique-avec-python","status":"publish","type":"page","link":"https:\/\/www.mathweb.fr\/euclide\/nuage-de-points-dune-suite-numerique-avec-python\/","title":{"rendered":"Nuage de points d&rsquo;une suite num\u00e9rique avec Python"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Nous allons voir comment cr\u00e9er un nuage de points repr\u00e9sentant une suite num\u00e9rique (arithm\u00e9tique, g\u00e9om\u00e9trique ou autre) avec Python.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">Le principe est tr\u00e8s simple: utiliser <em>matplotlib<\/em>, une librairie de Python, pour construire le nuage de points associ\u00e9s \u00e0 n&rsquo;importe quelle suite num\u00e9rique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nuage de points d&rsquo;une suite arithm\u00e9tique avec Python<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Prenons l&rsquo;exemple de la suite \\( (u_n) \\) d\u00e9finie pour tout entier naturel \\(n\\) par:$$\\begin{cases}u_0=-3\\\\u_{n+1}=u_n+2,5\\end{cases}$$<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import matplotlib.pyplot as plt\n\ndef u(n):\n    if n == 0:\n        return -3 # valeur de u(0)\n    \n    return u(n-1) + 2.5\n\nx = [ n for n in range(10) ] \ny = [ u(n) for n in range(10) ]\n\nplt.scatter(x,y)\n\nplt.title('Nuage de points : suite arithm\u00e9tique')\nplt.xlabel('x')\nplt.ylabel('y')\n\nplt.show()<\/pre>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suite-arithmetique-python.jpg\" alt=\"nuage de points d'une suite arithm\u00e9tique avec Python\" class=\"wp-image-7354\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suite-arithmetique-python.jpg 640w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suite-arithmetique-python-300x225.jpg 300w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suite-arithmetique-python-600x450.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;id\u00e9e est de construire deux listes:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>une liste \u00ab\u00a0x\u00a0\u00bb contenant toutes les valeurs de l&rsquo;indice <em>n<\/em> (ligne 9);<\/li><li>une liste \u00ab\u00a0y\u00a0\u00bb contenant toutes les valeurs de \\(u_n\\) pour <em>n<\/em> variant dans la liste \u00ab\u00a0x\u00a0\u00bb.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Remarquez que nous avons construit les listes <em>par compr\u00e9hension<\/em>, ce qui va plus vite. Sinon, \u00e0 la place des lignes 9 et 10, on aurait pu \u00e9crire:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"false\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">x , y = [] , []\nfor n in range(10):\n    x.append(n)\n    y.append( u(n) )<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Pour notre exemple, les listes \u00ab\u00a0x\u00a0\u00bb et \u00ab\u00a0y\u00a0\u00bb donnent alors:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = &#91;0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\ny = &#91;-3, -0.5, 2.0, 4.5, 7.0, 9.5, 12.0, 14.5, 17.0, 19.5]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ensuite, on demande \u00e0 la fonction <em>scatter<\/em> de mettre tous les points de coordonn\u00e9es \\( (x_i;y_i) \\).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bien entendu, je me suis ici limit\u00e9 \u00e0 10 termes, mais on peut moduler ce nombre en changeant le param\u00e8tre de la fonction <em>range<\/em> aux lignes 9 et 10.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nuage de points d&rsquo;une suite g\u00e9om\u00e9trique avec Python<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Prenons l&rsquo;exemple des suites \\( (u_n) \\) et \\( (v_n) \\) d\u00e9finies pour tout entier naturel \\(n\\) par:$$\\begin{cases}u_0=2\\\\u_{n+1}=1,05u_n\\end{cases}\\quad\\text{et}\\quad\\begin{cases}v_0=4\\\\v_{n+1}=0,7v_n\\end{cases}$$<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import matplotlib.pyplot as plt\n\ndef u(n):\n    if n == 0:\n        return 2 # valeur de u(0)\n    \n    return u(n-1) * 1.05\n\ndef v(n):\n    if n == 0:\n        return 4 # valeur de v(0)\n    \n    return v(n-1) * 0.7\n\nx = [ n for n in range(10) ] \ny = [ u(n) for n in range(10) ]\nz = [ v(n) for n in range(10) ]\n\nplt.scatter(x , y , c = 'coral' , label = 'u(n): q > 1')\nplt.scatter(x , z , c = 'blue' , label = 'v(n): 0 &lt; q &lt; 1')\n\nplt.title('Nuage de points : suites g\u00e9om\u00e9triques')\nplt.legend()\nplt.savefig('nuage-points-suites-geometriques-python.jpg')\nplt.show()\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Afin de construire plusieurs nuages de points, il suffit de faire appel \u00e0 <em>scatter<\/em> autant de fois qu&rsquo;il y a de nuages \u00e0 construire. Pour les diff\u00e9rencier, il faudra alors utiliser des couleurs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La liste des couleurs est disponible sur la page <a href=\"https:\/\/matplotlib.org\/stable\/gallery\/color\/named_colors.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/matplotlib.org\/stable\/gallery\/color\/named_colors.html<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-geometriques-python.jpg\" alt=\"nuages de points de suites g\u00e9om\u00e9triques avec Python\" class=\"wp-image-7355\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-geometriques-python.jpg 640w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-geometriques-python-300x225.jpg 300w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-geometriques-python-600x450.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Nuages de points d&rsquo;une suite quelconque avec Python<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pour simplifier les choses, on pourrait imaginer une fonction <em>trace<\/em> qui tracerait toutes les suites d&rsquo;un seul coup. Je vous propose alors le programme suivant:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import matplotlib.pyplot as plt\n\ndef trace(n , suites_liste , couleurs_liste , labels_liste , titre , save = False, name = 'nuage.jpg'):\n    x = [ k for k in range(n) ]\n    for suite in suites_liste:\n        i = suites_liste.index(suite)\n        y = [ suite(k) for k in range(n) ]\n        plt.scatter(x , y , c = couleurs_liste[i] , label = labels_liste[i])\n    \n    plt.legend()\n    if save == True:\n        plt.savefig(name)\n    plt.show()<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ici, la difficult\u00e9 est d&rsquo;informer l&rsquo;expression de chacune des suites. J&rsquo;ai opt\u00e9 pour la <em>syntaxe lambda<\/em>. Par exemple,<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>u = lambda k: 1.05*u(k-1) if k&gt;=1 else 2.5<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">d\u00e9signera la suite g\u00e9om\u00e9trique de premier terme 2,5 et de raison 1,05.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela donne par exemple:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>u = lambda k: 1.05*u(k-1) if k&gt;=1 else 2.5\nv = lambda k: 0.95*v(k-1) if k&gt;=1 else 7\nw = lambda k: 0.5*w(k-1) if k&gt;=1 else 10\n\nL = &#91;u,v,w]\nC = &#91;'coral','blue','green']\nLAB = &#91;'u','v','w']\ntitre = 'Nuage de points : suites g\u00e9om\u00e9triques'\n\ntrace(20,L,C,LAB,'Nuage de points : suites g\u00e9om\u00e9triques',titre)<\/code><\/pre>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-python.jpg\" alt=\"nuages de points de suites g\u00e9om\u00e9triques avec Python\" class=\"wp-image-7356\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-python.jpg 640w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-python-300x225.jpg 300w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2022\/03\/nuage-points-suites-python-600x450.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nous allons voir comment cr\u00e9er un nuage de points repr\u00e9sentant une suite num\u00e9rique (arithm\u00e9tique, g\u00e9om\u00e9trique ou autre) avec Python.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-7353","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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