{"id":2871,"date":"2023-07-20T08:04:01","date_gmt":"2023-07-20T08:04:01","guid":{"rendered":"https:\/\/statorials.org\/it\/matplotlib-aline\/"},"modified":"2023-07-20T08:04:01","modified_gmt":"2023-07-20T08:04:01","slug":"matplotlib-aline","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/matplotlib-aline\/","title":{"rendered":"Come utilizzare la funzione abline in matplotlib"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">La funzione <a href=\"https:\/\/statorials.org\/it\/abline-nel-r\/\" target=\"_blank\" rel=\"noopener\">abline<\/a> in R pu\u00f2 essere utilizzata per aggiungere una linea retta a un percorso.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Sfortunatamente questa funzione non esiste in Matplotlib, ma possiamo definire la seguente funzione per replicare la funzione abline in Python:<\/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: #008000;\">def<\/span> <span style=\"color: #0000ff;\">abline<\/span> (slope, intercept):\n    axes = plt. <span style=\"color: #3366ff;\">gca<\/span> ()\n    x_vals = np. <span style=\"color: #3366ff;\">array<\/span> ( <span style=\"color: #3366ff;\">axes.get_xlim<\/span> ())\n    y_vals = intercept + slope * x_vals\n    plt. <span style=\"color: #3366ff;\">plot<\/span> (x_vals, y_vals, '--')\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">I seguenti esempi mostrano come utilizzare questa sintassi in pratica con i seguenti DataFrame panda:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame\n<\/span>df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">x<\/span> ': [1, 1, 2, 3, 4, 4, 5, 6, 7, 7, 8, 9, 10, 11],\n                   ' <span style=\"color: #ff0000;\">y<\/span> ': [13, 14, 17, 12, 23, 24, 25, 25, 24, 28, 32, 33, 35, 40]})\n\n<span style=\"color: #008080;\">#view first five rows of DataFrame\n<\/span>df. <span style=\"color: #3366ff;\">head<\/span> ()\n\n\tx y\n0 1 13\n1 1 14\n2 2 17\n3 3 12\n4 4 23<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 1: utilizzo di Abline per disegnare una linea orizzontale<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo usare il seguente codice per disegnare una linea orizzontale con la funzione <strong>abline<\/strong> definita in precedenza:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create scatterplot\n<\/span>plt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )\n\n<span style=\"color: #008080;\">#add horizontal line at y=30\n<\/span>abline( <span style=\"color: #008000;\">0,30<\/span> <span style=\"color: #008000;\">)<\/span><\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25090 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/abline1-1.jpg\" alt=\"\" width=\"566\" height=\"379\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Il risultato \u00e8 una linea orizzontale in y=30.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 2: utilizzare aline per tracciare una linea con una pendenza e un&#8217;intersezione specifiche<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo usare il seguente codice per disegnare una linea con una pendenza di <strong>3<\/strong> e un&#8217;intercetta y di <strong>15<\/strong> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create scatterplot\n<\/span>plt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )\n\n<span style=\"color: #008080;\">#add straight line with slope=3 and intercept=15\n<\/span>abline( <span style=\"color: #008000;\">3,15<\/span> <span style=\"color: #008000;\">)<\/span><\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25092 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/abline3-1.jpg\" alt=\"\" width=\"541\" height=\"360\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Il risultato \u00e8 una linea retta con pendenza 3 e intersezione 15.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 3: utilizzare abline per tracciare la retta di regressione<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare il codice seguente per tracciare una linea di regressione con la funzione <strong>abline<\/strong> definita in precedenza:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate slope and intercept of regression line\n<span style=\"color: #000000;\">slope = np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 1)[ <span style=\"color: #008000;\">0<\/span> ]<\/span>\n<span style=\"color: #000000;\">intercept = np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 1)[ <span style=\"color: #008000;\">1<\/span> ]<\/span>\n\n#create scatterplot\n<\/span>plt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )\n\n<span style=\"color: #008080;\">#add regression line\n<\/span><span style=\"color: #000000;\">abline(slope, intercept)<\/span><\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25091 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/abline2-1.jpg\" alt=\"\" width=\"544\" height=\"362\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Il risultato \u00e8 una linea di regressione adattata che passa direttamente attraverso i punti del grafico.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : puoi trovare la documentazione completa della funzione <strong>polyfit<\/strong> in NumPy <a href=\"https:\/\/numpy.org\/doc\/stable\/reference\/generated\/numpy.polyfit.html\" target=\"_blank\" rel=\"noopener\">qui<\/a> .<\/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 eseguire altre attivit\u00e0 comuni nei panda:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/it\/colonne-di-somma-specifiche-dei-panda\/\" target=\"_blank\" rel=\"noopener\">Come sommare colonne specifiche in Pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/colonna-somma-panda-con-condizione\/\" target=\"_blank\" rel=\"noopener\">Come sommare le colonne in base a una condizione in Pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/panda-cumsum-inverso\/\" target=\"_blank\" rel=\"noopener\">Come calcolare una somma cumulativa inversa in panda<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La funzione abline in R pu\u00f2 essere utilizzata per aggiungere una linea retta a un percorso. Sfortunatamente questa funzione non esiste in Matplotlib, ma possiamo definire la seguente funzione per replicare la funzione abline in Python: import matplotlib. pyplot as plt import numpy as np def abline (slope, intercept): axes = plt. gca () x_vals [&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 utilizzare la funzione abline in Matplotlib \u2013 Stology<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come creare la funzione abline in Matplotlib simile a quella utilizzata in R, con un esempio.\" \/>\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\/matplotlib-aline\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come utilizzare la funzione abline in Matplotlib \u2013 Stology\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come creare la funzione abline in Matplotlib simile a quella utilizzata in R, con un esempio.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/matplotlib-aline\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T08:04:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/abline1-1.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\/matplotlib-aline\/\",\"url\":\"https:\/\/statorials.org\/it\/matplotlib-aline\/\",\"name\":\"Come utilizzare la funzione abline in Matplotlib \u2013 Stology\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-20T08:04:01+00:00\",\"dateModified\":\"2023-07-20T08:04:01+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come creare la funzione abline in Matplotlib simile a quella utilizzata in R, con un esempio.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/matplotlib-aline\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/matplotlib-aline\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/matplotlib-aline\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come utilizzare la funzione abline 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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