{"id":2926,"date":"2023-07-20T01:49:40","date_gmt":"2023-07-20T01:49:40","guid":{"rendered":"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/"},"modified":"2023-07-20T01:49:40","modified_gmt":"2023-07-20T01:49:40","slug":"istogramma-della-frequenza-relativa-matplotlib","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/","title":{"rendered":"Come creare un istogramma di frequenza relativo in matplotlib"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Un <a href=\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-1\/\" target=\"_blank\" rel=\"noopener\">istogramma di frequenza relativa<\/a> \u00e8 un grafico che mostra le frequenze relative dei valori in un set di dati.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Puoi utilizzare la seguente sintassi per creare un istogramma di frequenza relativo in Matplotlib in Python:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">import<\/span> matplotlib. <span style=\"color: #3366ff;\">pyplot<\/span> <span style=\"color: #008000;\">as<\/span> plt<\/span>\n<span style=\"color: #000000;\"><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np<\/span>\n<\/span>\n<span style=\"color: #008080;\">#define plotting area\n<\/span>fig = plt. <span style=\"color: #3366ff;\">figure<\/span> ()\nax = fig. <span style=\"color: #3366ff;\">add_subplot<\/span> (111)\n\n<span style=\"color: #008080;\">#create relative frequency histogram\n<\/span>ax. <span style=\"color: #3366ff;\">hist<\/span> (data, edgecolor=' <span style=\"color: #ff0000;\">black<\/span> ', weights=np. <span style=\"color: #3366ff;\">ones_like<\/span> (data) \/ <span style=\"color: #008000;\">len<\/span> (data))<\/strong>\n<\/pre>\n<p> <span style=\"color: #000000;\">L&#8217;esempio seguente mostra come utilizzare questa sintassi nella pratica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio: creare un istogramma di frequenza relativa in Matplotlib<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come creare un istogramma di frequenza regolare in Matplotlib:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n<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 data values\n<\/span>data = [8, 8, 9, 12, 13, 13, 14, 14, 15, 18, 22, 23, 24, 25, 30]\n\n<span style=\"color: #008080;\">#create frequency histogram\n<\/span>fig = plt. <span style=\"color: #3366ff;\">figure<\/span> ()\nax = fig. <span style=\"color: #3366ff;\">add_subplot<\/span> (111)\nax. <span style=\"color: #3366ff;\">hist<\/span> (data, edgecolor=' <span style=\"color: #ff0000;\">black<\/span> ')<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25439 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/refreq11.jpg\" alt=\"\" width=\"528\" height=\"355\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">L&#8217;asse x mostra i contenitori per i valori dei dati e l&#8217;asse y mostra la frequenza di ciascun contenitore.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Possiamo usare il seguente codice per visualizzare <strong>le frequenze relative<\/strong> sull&#8217;asse y:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n<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 data values\n<\/span>data = [8, 8, 9, 12, 13, 13, 14, 14, 15, 18, 22, 23, 24, 25, 30]\n\n<span style=\"color: #008080;\">#create relative frequency histogram\n<\/span>fig = plt. <span style=\"color: #3366ff;\">figure<\/span> ()\nax = fig. <span style=\"color: #3366ff;\">add_subplot<\/span> (111)\nax. <span style=\"color: #3366ff;\">hist<\/span> (data, edgecolor=' <span style=\"color: #ff0000;\">black<\/span> ', weights=np. <span style=\"color: #3366ff;\">ones_like<\/span> (data) \/ <span style=\"color: #008000;\">len<\/span> (data))<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25440 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/refreq12.jpg\" alt=\"\" width=\"527\" height=\"342\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">L&#8217;asse y ora mostra le frequenze relative.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ad esempio, nel set di dati sono presenti 15 valori totali.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Quindi, invece di mostrare una frequenza pari a <strong>4<\/strong> sull&#8217;asse y per la barra pi\u00f9 in alto nel grafico, l&#8217;asse y ora mostra 4\/15 = <strong>0,2667<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Possiamo anche utilizzare la funzione <strong>PercentFormatter()<\/strong> di Matplotlib per visualizzare i valori sull&#8217;asse y come percentuali:<\/span><b> <\/b><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"><span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n<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;\">from<\/span> matplotlib. <span style=\"color: #3366ff;\">ticker<\/span> <span style=\"color: #008000;\">import<\/span> PercentFormatter\n\n<span style=\"color: #008080;\">#define data values\n<\/span>data = [8, 8, 9, 12, 13, 13, 14, 14, 15, 18, 22, 23, 24, 25, 30]\n\n<span style=\"color: #008080;\">#create relative frequency histogram with percentages on y-axis\n<\/span>fig = plt. <span style=\"color: #3366ff;\">figure<\/span> ()\nax = fig. <span style=\"color: #3366ff;\">add_subplot<\/span> (111)\nax. <span style=\"color: #3366ff;\">hist<\/span> (data, edgecolor=' <span style=\"color: #ff0000;\">black<\/span> ', weights=np. <span style=\"color: #3366ff;\">ones_like<\/span> (data)* <span style=\"color: #008000;\">100<\/span> \/ <span style=\"color: #008000;\">len<\/span> (data))\nax. <span style=\"color: #3366ff;\">yaxis<\/span> . <span style=\"color: #3366ff;\">set_major_formatter<\/span> (PercentFormatter())\n<\/strong><\/span><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-25441\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/refreq13.jpg\" alt=\"Istogramma della frequenza relativa di Matplotlib\" width=\"545\" height=\"348\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Tieni presente che l&#8217;asse y ora mostra le frequenze relative come percentuali.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">I seguenti tutorial spiegano come creare altri grafici comuni in Matplotlib:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/it\/istogramma-dei-colori-matplotlib\/\" target=\"_blank\" rel=\"noopener\">Come cambiare il colore di un istogramma Matplotlib<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/dimensione-del-contenitore-matplotlib\/\" target=\"_blank\" rel=\"noopener\">Come regolare la dimensione del contenitore negli istogrammi Matplotlib<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/istogramma-del-panda\/\" target=\"_blank\" rel=\"noopener\">Come creare un istogramma da Pandas DataFrame<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un istogramma di frequenza relativa \u00e8 un grafico che mostra le frequenze relative dei valori in un set di dati. Puoi utilizzare la seguente sintassi per creare un istogramma di frequenza relativo in Matplotlib in Python: import matplotlib. pyplot as plt import numpy as np #define plotting area fig = plt. figure () ax = [&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 istogramma di frequenza relativo in Matplotlib - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come creare un istogramma di frequenza relativa in Matplotlib, incluso un esempio completo.\" \/>\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\/istogramma-della-frequenza-relativa-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 istogramma di frequenza relativo in Matplotlib - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come creare un istogramma di frequenza relativa in Matplotlib, incluso un esempio completo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T01:49:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/refreq11.jpg\" \/>\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\/istogramma-della-frequenza-relativa-matplotlib\/\",\"url\":\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/\",\"name\":\"Come creare un istogramma di frequenza relativo in Matplotlib - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-20T01:49:40+00:00\",\"dateModified\":\"2023-07-20T01:49:40+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come creare un istogramma di frequenza relativa in Matplotlib, incluso un esempio completo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/istogramma-della-frequenza-relativa-matplotlib\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come creare un istogramma di frequenza relativo in matplotlib\"}]},{\"@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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