{"id":1192,"date":"2023-07-27T08:27:48","date_gmt":"2023-07-27T08:27:48","guid":{"rendered":"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/"},"modified":"2023-07-27T08:27:48","modified_gmt":"2023-07-27T08:27:48","slug":"proporzioni-matplotlib","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/","title":{"rendered":"Come impostare le proporzioni in matplotlib"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Le <strong>proporzioni<\/strong> di un grafico matplotlib si riferiscono all&#8217;aspetto del ridimensionamento dell&#8217;asse, ovvero al rapporto tra l&#8217;unit\u00e0 y e l&#8217;unit\u00e0 x.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Questo rapporto pu\u00f2 essere modificato utilizzando la funzione <a href=\"https:\/\/matplotlib.org\/stable\/api\/_as_gen\/matplotlib.axes.Axes.set_aspect.html\" target=\"_blank\" rel=\"noopener noreferrer\">matplotlib.axes.Axes.set_aspect()<\/a> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Dietro il cofano, la funzione <strong>set_aspect()<\/strong> cambia effettivamente quello che viene chiamato il <strong>sistema di coordinate dei dati<\/strong> , ma in pratica di solito vogliamo cambiare il <strong>sistema di coordinate di visualizzazione<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Per facilitare questa conversione, possiamo usare questo pezzo di codice:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define y-unit to x-unit ratio<\/span>\nratio = 1.0\n\n<span style=\"color: #008080;\">#get x and y limits\n<\/span>x_left, x_right = ax. <span style=\"color: #3366ff;\">get_xlim<\/span> ()\ny_low, y_high = ax. <span style=\"color: #3366ff;\">get_ylim<\/span> ()\n\n<span style=\"color: #008080;\">#set aspect ratio<\/span>\nax. <span style=\"color: #3366ff;\">set_aspect<\/span> ( <span style=\"color: #3366ff;\">abs<\/span> ((x_right-x_left)\/(y_low-y_high))*ratio)\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Esaminiamo un esempio di utilizzo pratico di questa funzione.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Passaggio 1: creare un grafico Matplotlib di base<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Innanzitutto, creiamo un semplice grafico a linee utilizzando Matplotlib:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib.pyplot <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define matplotlib figure and axis\n<\/span>fig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#create simple line plot\n<\/span>ax. <span style=\"color: #3366ff;\">plot<\/span> ([0, 10],[0, 20])\n\n<span style=\"color: #008080;\">#displayplot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11841 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/aspectratio1.png\" alt=\"\" width=\"387\" height=\"250\" srcset=\"\" sizes=\"\"><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Passaggio 2: imposta le proporzioni (nel modo sbagliato)<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Tieni presente che l&#8217;asse x \u00e8 pi\u00f9 lungo dell&#8217;asse y. Proviamo a impostare le proporzioni su 1, ovvero gli assi x e y dovrebbero essere uguali:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib.pyplot <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define matplotlib figure and axis\n<\/span>fig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#create simple line plot\n<\/span>ax. <span style=\"color: #3366ff;\">plot<\/span> ([0, 10],[0, 20])\n\n<span style=\"color: #008080;\">#attempt to set aspect ratio to 1\n<\/span>ax. <span style=\"color: #3366ff;\">set_aspect<\/span> (1)\n\n<span style=\"color: #008080;\">#displayplot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11842 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/aspectratio2.png\" alt=\"\" width=\"174\" height=\"276\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Tieni presente che questo non ha funzionato come previsto. L&#8217;asse y \u00e8 molto pi\u00f9 lungo dell&#8217;asse x.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Passaggio 3: imposta le proporzioni (nel modo giusto)<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come utilizzare un semplice calcolo per impostare le proporzioni corrette:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib.pyplot <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define matplotlib figure and axis\n<\/span>fig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#create simple line plot\n<\/span>ax. <span style=\"color: #3366ff;\">plot<\/span> ([0, 10],[0, 20])\n\n<span style=\"color: #008080;\">#set aspect ratio to 1\n<\/span>ratio = 1.0\nx_left, x_right = ax. <span style=\"color: #3366ff;\">get_xlim<\/span> ()\ny_low, y_high = ax. <span style=\"color: #3366ff;\">get_ylim<\/span> ()\nax. <span style=\"color: #3366ff;\">set_aspect<\/span> ( <span style=\"color: #3366ff;\">abs<\/span> ((x_right-x_left)\/(y_low-y_high))*ratio)\n\n<span style=\"color: #008080;\">#displayplot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11843 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/rapport-daspect3.png\" alt=\"Imposta le proporzioni della trama matplotlib\" width=\"295\" height=\"273\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Tieni presente che questo grafico ha le proporzioni che ci aspettavamo. L&#8217;asse x e l&#8217;asse y hanno la stessa lunghezza.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Passaggio 4: regola le proporzioni come preferisci<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Se vogliamo che l&#8217;asse y sia pi\u00f9 lungo dell&#8217;asse x, possiamo semplicemente specificare che le proporzioni siano un numero maggiore di 1:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib.pyplot <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define matplotlib figure and axis\n<\/span>fig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#create simple line plot\n<\/span>ax. <span style=\"color: #3366ff;\">plot<\/span> ([0, 10],[0, 20])\n\n<span style=\"color: #008080;\">#set aspect ratio to 3\n<\/span>ratio = 3\nx_left, x_right = ax. <span style=\"color: #3366ff;\">get_xlim<\/span> ()\ny_low, y_high = ax. <span style=\"color: #3366ff;\">get_ylim<\/span> ()\nax. <span style=\"color: #3366ff;\">set_aspect<\/span> ( <span style=\"color: #3366ff;\">abs<\/span> ((x_right-x_left)\/(y_low-y_high))*ratio)\n\n<span style=\"color: #008080;\">#displayplot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11844 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/aspectratio4.png\" alt=\"formato immagine matplotlib\" width=\"141\" height=\"277\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">E se vogliamo che l&#8217;asse y sia pi\u00f9 corto dell&#8217;asse x, possiamo semplicemente specificare che le proporzioni siano un numero inferiore a 1:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> matplotlib.pyplot <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#define matplotlib figure and axis\n<\/span>fig, ax = plt. <span style=\"color: #3366ff;\">subplots<\/span> ()\n\n<span style=\"color: #008080;\">#create simple line plot\n<\/span>ax. <span style=\"color: #3366ff;\">plot<\/span> ([0, 10],[0, 20])\n\n<span style=\"color: #008080;\">#set aspect ratio to .3\n<\/span>ratio = .3\nx_left, x_right = ax. <span style=\"color: #3366ff;\">get_xlim<\/span> ()\ny_low, y_high = ax. <span style=\"color: #3366ff;\">get_ylim<\/span> ()\nax. <span style=\"color: #3366ff;\">set_aspect<\/span> ( <span style=\"color: #3366ff;\">abs<\/span> ((x_right-x_left)\/(y_low-y_high))*ratio)\n\n<span style=\"color: #008080;\">#displayplot\n<\/span>plt. <span style=\"color: #3366ff;\">show<\/span> ()<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-11845 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/rapport-daspect5.png\" alt=\"Proporzioni dell'asse x di Matplotlib pi\u00f9 lunghe dell'asse y\" width=\"402\" height=\"142\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\"><em>Puoi trovare altri tutorial su Matplotlib qui .<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le proporzioni di un grafico matplotlib si riferiscono all&#8217;aspetto del ridimensionamento dell&#8217;asse, ovvero al rapporto tra l&#8217;unit\u00e0 y e l&#8217;unit\u00e0 x. Questo rapporto pu\u00f2 essere modificato utilizzando la funzione matplotlib.axes.Axes.set_aspect() . Dietro il cofano, la funzione set_aspect() cambia effettivamente quello che viene chiamato il sistema di coordinate dei dati , ma in pratica di solito [&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 impostare le proporzioni in Matplotlib - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come impostare le proporzioni 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\/proporzioni-matplotlib\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come impostare le proporzioni in Matplotlib - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come impostare le proporzioni in Matplotlib, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T08:27:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/aspectratio1.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\/proporzioni-matplotlib\/\",\"url\":\"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/\",\"name\":\"Come impostare le proporzioni in Matplotlib - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-27T08:27:48+00:00\",\"dateModified\":\"2023-07-27T08:27:48+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come impostare le proporzioni in Matplotlib, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/proporzioni-matplotlib\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come impostare le proporzioni 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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