{"id":1103,"date":"2023-07-27T16:04:00","date_gmt":"2023-07-27T16:04:00","guid":{"rendered":"https:\/\/statorials.org\/id\/produk-titik-di-r\/"},"modified":"2023-07-27T16:04:00","modified_gmt":"2023-07-27T16:04:00","slug":"produk-titik-di-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/id\/produk-titik-di-r\/","title":{"rendered":"Cara menghitung perkalian titik di r: dengan contoh"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Diketahui vektor <em>a<\/em> = [a <sub>1<\/sub> , a <sub>2<\/sub> , a <sub>3<\/sub> ] dan vektor <em>b<\/em> = [b <sub>1<\/sub> , b <sub>2<\/sub> , b <sub>3<\/sub> ], <strong>hasil kali skalar<\/strong> vektor a dan vektor b, dilambangkan <strong>ab<\/strong> , diberikan oleh:<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab<\/strong> = a <sub>1<\/sub> * b <sub>1<\/sub> + a <sub>2<\/sub> * b <sub>2<\/sub> + a <sub>3<\/sub> * b <sub>3<\/sub><\/span><\/p>\n<p> <span style=\"color: #000000;\">Misalnya, jika <em>a<\/em> = [2, 5, 6] dan <em>b<\/em> = [4, 3, 2], maka hasil kali titik dari <em>a<\/em> dan <em>b<\/em> sama dengan:<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 2*4 + 5*3 + 6*2<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 8 + 15 + 12<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 35<\/span><\/p>\n<p> <span style=\"color: #000000;\">Pada dasarnya, perkalian titik adalah jumlah perkalian entri-entri yang bersesuaian dalam dua vektor.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Cara menghitung perkalian titik di R<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Ada dua cara untuk menghitung perkalian titik dua vektor di R dengan cepat:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Metode 1: Gunakan %*%<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Kode berikut menunjukkan cara menggunakan fungsi <strong>%*%<\/strong> untuk menghitung perkalian titik antara dua vektor di R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#definevectors<\/span>\na &lt;- c(2, 5, 6)\nb &lt;- c(4, 3, 2)\n\n<span style=\"color: #008080;\">#calculate dot product between vectors\n<\/span>a %*% b\n\n     [,1]\n[1,] 35<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Hasil perkalian titiknya adalah <strong>35<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Perhatikan bahwa fungsi ini juga berfungsi untuk kolom bingkai data:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define data<\/span>\ndf &lt;- data.frame(a=c(2, 5, 6),\n                 b=c(4, 3, 2))\n\n<span style=\"color: #008080;\">#calculate dot product between columns 'a' and 'b' of data frame\n<\/span>df$a %*% df$b\n\n     [,1]\n[1,] 35<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Metode 2: Gunakan fungsi titik()<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Kita juga dapat menghitung perkalian titik antara dua vektor menggunakan fungsi <strong>dot()<\/strong> dari perpustakaan <strong>pracma<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #993300;\">library<\/span> (pracma)<\/span>\n\n#definevectors<\/span>\na &lt;- c(2, 5, 6)\nb &lt;- c(4, 3, 2)\n\n<span style=\"color: #008080;\">#calculate dot product between vectors\n<\/span>dot(a,b)\n\n[1] 35<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Sekali lagi, hasil kali titik antara kedua vektor tersebut adalah <strong>35<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Terkait:<\/strong> <a href=\"https:\/\/statorials.org\/id\/persilangan-produk-di-sungai\/\" target=\"_blank\" rel=\"noopener\">Cara Menghitung Perkalian Silang di R<\/a><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Sumber daya tambahan<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Tutorial berikut menjelaskan cara menghitung perkalian titik menggunakan software statistik lainnya:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/id\/cara-mudah-menghitung-perkalian-titik-di-excel\/\" target=\"_blank\" rel=\"noopener noreferrer\">Cara Menghitung Perkalian Titik di Excel<\/a><br \/> <a href=\"https:\/\/statorials.org\/id\/lembar-google-produk-titik\/\" target=\"_blank\" rel=\"noopener noreferrer\">Cara Menghitung Produk Titik di Google Spreadsheet<\/a><br \/> <a href=\"https:\/\/statorials.org\/id\/produk-titik-ti-84\/\">Cara Menghitung Perkalian Titik pada Kalkulator TI-84<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Diketahui vektor a = [a 1 , a 2 , a 3 ] dan vektor b = [b 1 , b 2 , b 3 ], hasil kali skalar vektor a dan vektor b, dilambangkan ab , diberikan oleh: ab = a 1 * b 1 + a 2 * b 2 + a 3 [&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>Cara menghitung perkalian titik di R (dengan contoh) - Statorial<\/title>\n<meta name=\"description\" content=\"Tutorial ini menjelaskan cara menghitung perkalian titik di R, dengan beberapa contoh.\" \/>\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\/id\/produk-titik-di-r\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cara menghitung perkalian titik 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