{"id":3981,"date":"2023-07-14T09:17:12","date_gmt":"2023-07-14T09:17:12","guid":{"rendered":"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/"},"modified":"2023-07-14T09:17:12","modified_gmt":"2023-07-14T09:17:12","slug":"alfa-geom_point-ggplot2","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/","title":{"rendered":"Como usar alfa com geom_point() no ggplot2"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Voc\u00ea pode usar o argumento <strong>alfa<\/strong> na fun\u00e7\u00e3o <strong>geom_point()<\/strong> em ggplot2 para alterar a transpar\u00eancia dos pontos em um gr\u00e1fico.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este argumento usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>ggplot(df, aes(x=x, y=y)) +\n  geom_point(alpha= <span style=\"color: #008000;\">1<\/span> )\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">O valor de <strong>alfa<\/strong> pode estar entre 0 e 1 onde:<\/span><\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong> \u00e9 completamente transparente<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> \u00e9 completamente s\u00f3lido<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">O valor padr\u00e3o para <strong>alfa<\/strong> \u00e9 <strong>1<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ao definir <strong>alfa<\/strong> para um valor menor que 1, fica mais f\u00e1cil visualizar pontos sobrepostos em um gr\u00e1fico, o que \u00e9 especialmente \u00fatil ao plotar pontos de um grande conjunto de dados.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar o argumento <strong>alfa<\/strong> na pr\u00e1tica com o seguinte quadro de dados contendo 5.000 linhas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#make this example reproducible\n<\/span>set. <span style=\"color: #3366ff;\">seeds<\/span> (1)\n\n<span style=\"color: #008080;\">#create data frame with 5000 rows\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (x=runif(n=5000, min=1, max=100))\n\ndf$y = df$x*3 + runif(5000)*df$x^2\n\n<span style=\"color: #008080;\">#view head of data frame\n<\/span>head(df)\n\n         xy\n1 27.28536 108.2851\n2 37.84027 622.8478\n3 57.71248 1002.0662\n4 90.91257 7539.2476\n5 20.96651 202.6813\n6 89.94058 2867.4643\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Relacionado:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/runif-em-r\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o runif em R<\/a><\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 1: Usando alfa = 1 em geom_point()<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar um gr\u00e1fico de dispers\u00e3o em ggplot2 usando o valor padr\u00e3o 1 para o argumento <strong>alfa<\/strong> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (ggplot2)\n<\/span>\n#create scatter plot with default alpha value\n<span style=\"color: #000000;\">ggplot(df, aes(x=x, y=y)) +\n  geom_point()\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31885 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/alpha3.jpg\" alt=\"\" width=\"587\" height=\"428\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Observe que os pontos do gr\u00e1fico s\u00e3o completamente s\u00f3lidos, o que corresponde a um valor <strong>alfa<\/strong> de 1.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 2: Usando alfa = 0 em geom_point()<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar um gr\u00e1fico de dispers\u00e3o em ggplot2 usando um valor 0 para o argumento <strong>alfa<\/strong> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (ggplot2)\n<\/span>\n#create scatter plot with alpha value of 0\n<span style=\"color: #000000;\">ggplot(df, aes(x=x, y=y)) +\n  geom_point(alpha= <span style=\"color: #008000;\">0<\/span> )\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31886 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/alpha4.jpg\" alt=\"\" width=\"586\" height=\"430\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Todos os pontos no caminho s\u00e3o completamente transparentes, o que corresponde a um valor <strong>alfa<\/strong> de 0.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 3: Usando alfa = 0,1 em geom_point()<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar um gr\u00e1fico de dispers\u00e3o em ggplot2 usando um valor de 0,1 para o argumento <strong>alfa<\/strong> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (ggplot2)\n<\/span>\n#create scatter plot with alpha value of 0.1\n<span style=\"color: #000000;\">ggplot(df, aes(x=x, y=y)) +\n  geom_point(alpha= <span style=\"color: #008000;\">0.1<\/span> )\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31887 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/alpha5.jpg\" alt=\"\" width=\"606\" height=\"445\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Ao definir <strong>alfa<\/strong> como 0,1, os pontos t\u00eam um n\u00edvel de transpar\u00eancia que nos permite ver onde os pontos se sobrep\u00f5em mais no gr\u00e1fico.<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\">Sinta-se \u00e0 vontade para brincar com o valor de <strong>alfa<\/strong> na fun\u00e7\u00e3o <strong>geom_point()<\/strong> para obter um n\u00edvel de transpar\u00eancia que torne seu gr\u00e1fico mais f\u00e1cil de ler.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como realizar outras tarefas comuns no ggplot2:<\/span><\/p>\n<p> Como remover r\u00f3tulos de eixo no ggplot2<br \/> <a href=\"https:\/\/statorials.org\/pt\/remover-legenda-do-ggplot2\/\" target=\"_blank\" rel=\"noopener\">Como remover uma legenda no ggplot2<\/a><br \/> Como remover linhas de grade no ggplot2<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea pode usar o argumento alfa na fun\u00e7\u00e3o geom_point() em ggplot2 para alterar a transpar\u00eancia dos pontos em um gr\u00e1fico. Este argumento usa a seguinte sintaxe b\u00e1sica: ggplot(df, aes(x=x, y=y)) + geom_point(alpha= 1 ) O valor de alfa pode estar entre 0 e 1 onde: 0 \u00e9 completamente transparente 1 \u00e9 completamente s\u00f3lido O valor [&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":[],"class_list":["post-3981","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como usar alfa com geom_point() em ggplot2 \u2013 Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como usar o argumento alfa na fun\u00e7\u00e3o geom_point() em ggplot2, com v\u00e1rios exemplos.\" \/>\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\/pt\/alfa-geom_point-ggplot2\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como usar alfa com geom_point() em ggplot2 \u2013 Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como usar o argumento alfa na fun\u00e7\u00e3o geom_point() em ggplot2, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-14T09:17:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/alpha3.jpg\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/\",\"url\":\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/\",\"name\":\"Como usar alfa com geom_point() em ggplot2 \u2013 Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-14T09:17:12+00:00\",\"dateModified\":\"2023-07-14T09:17:12+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como usar o argumento alfa na fun\u00e7\u00e3o geom_point() em ggplot2, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/alfa-geom_point-ggplot2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como usar alfa com geom_point() no ggplot2\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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