{"id":1184,"date":"2023-07-27T09:08:03","date_gmt":"2023-07-27T09:08:03","guid":{"rendered":"https:\/\/statorials.org\/it\/faretra-matplotlib\/"},"modified":"2023-07-27T09:08:03","modified_gmt":"2023-07-27T09:08:03","slug":"faretra-matplotlib","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/faretra-matplotlib\/","title":{"rendered":"Come creare un grafico quiver in matplotlib (con esempi)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Un <strong>grafico quiver<\/strong> \u00e8 un tipo di grafico che visualizza frecce con componenti direzionali U e V in coordinate cartesiane specificate da X e Y.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Possiamo creare facilmente un grafico quiver in Matplotlib utilizzando la funzione <strong>quiver()<\/strong> , che utilizza la seguente sintassi:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>faretra (x, y, u, v)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Oro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x:<\/strong> le coordinate x delle posizioni delle frecce<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>y:<\/strong> le coordinate y delle posizioni delle frecce<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>u:<\/strong> le componenti x dei vettori freccia<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>v:<\/strong> le componenti y dei vettori freccia<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Questo tutorial fornisce diversi esempi di utilizzo pratico di questa funzione.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 1: disegno della faretra con una sola freccia<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come visualizzare un grafico quiver con una singola freccia:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib. <span style=\"color: #3366ff;\">pyplot<\/span> <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define plots<\/span>\nfig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#define coordinates and directions\n<\/span>x = 0\ny = 0\nu = 15\nv = 3\n\n<span style=\"color: #008080;\">#create quiver plot\n<\/span>ax. <span style=\"color: #3366ff;\">quiver<\/span> (x, y, u, v)\n\n<span style=\"color: #008080;\">#display quiver plot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11778 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/carquois1.png\" alt=\"Trama della faretra in matplotlib\" width=\"398\" height=\"261\" srcset=\"\" sizes=\"\"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 2: disposizione della faretra con due frecce<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come visualizzare un grafico quiver con due frecce:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib. <span style=\"color: #3366ff;\">pyplot<\/span> <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define plots<\/span>\nfig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#define coordinates and directions\n<\/span>x = [0, 0]\ny = [0, 0]\nu = [0, 1]\nv = [-2, 0]\n<span style=\"color: #008080;\">#create quiver plot\n<\/span>ax. <span style=\"color: #3366ff;\">quiver<\/span> (x, y, u, v, scale = <span style=\"color: #008000;\">10<\/span> )\n\n<span style=\"color: #008080;\">#display quiver plot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11779 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/carquois3.png\" alt=\"Faretra in pitone con due frecce\" width=\"409\" height=\"264\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Si noti che l&#8217;argomento <strong>scala<\/strong> ridimensiona le frecce per renderle pi\u00f9 lunghe, rendendole pi\u00f9 facili da vedere sul grafico.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 3: grafico quiver con una griglia a maglie<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come visualizzare un grafico quiver utilizzando una griglia mesh:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib. <span style=\"color: #3366ff;\">pyplot<\/span> <span style=\"color: #008000;\">as<\/span> plt\n<span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n\n<span style=\"color: #008080;\">#define plots<\/span>\nfig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#define coordinates and directions\n<\/span>x,y = np. <span style=\"color: #3366ff;\">meshgrid<\/span> (np. <span style=\"color: #3366ff;\">arange<\/span> (-2, 2, .1), np. <span style=\"color: #3366ff;\">arange<\/span> (-2, 2, .1))\nz = x*np. <span style=\"color: #3366ff;\">exp<\/span> (-x**2 - y**2)\nv, u = np. <span style=\"color: #3366ff;\">gradient<\/span> (z, .1, .1)\n\n<span style=\"color: #008080;\">#create quiver plot\n<\/span>ax. <span style=\"color: #3366ff;\">quiver<\/span> (x, y, u, v)\n\n<span style=\"color: #008080;\">#display quiver plot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11780 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/carquois4.png\" alt=\"Faretra Matplotlib\" width=\"436\" height=\"283\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Puoi trovare la documentazione completa della funzione quiver() <a href=\"https:\/\/matplotlib.org\/3.3.2\/api\/_as_gen\/matplotlib.pyplot.quiver.html\" target=\"_blank\" rel=\"noopener noreferrer\">qui<\/a> .<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un grafico quiver \u00e8 un tipo di grafico che visualizza frecce con componenti direzionali U e V in coordinate cartesiane specificate da X e Y. Possiamo creare facilmente un grafico quiver in Matplotlib utilizzando la funzione quiver() , che utilizza la seguente sintassi: faretra (x, y, u, v) Oro: x: le coordinate x delle posizioni [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come creare un grafico Quiver in Matplotlib (con esempi)<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come creare un grafico quiver in Matplotlib, con diversi esempi.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/it\/faretra-matplotlib\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come creare un grafico Quiver in Matplotlib (con esempi)\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come creare un grafico quiver in Matplotlib, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/faretra-matplotlib\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T09:08:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/carquois1.png\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/faretra-matplotlib\/\",\"url\":\"https:\/\/statorials.org\/it\/faretra-matplotlib\/\",\"name\":\"Come creare un grafico Quiver in Matplotlib (con esempi)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-27T09:08:03+00:00\",\"dateModified\":\"2023-07-27T09:08:03+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come creare un grafico quiver in Matplotlib, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/faretra-matplotlib\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/faretra-matplotlib\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/faretra-matplotlib\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come creare un grafico quiver in matplotlib (con esempi)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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