{"id":897,"date":"2023-07-28T09:32:44","date_gmt":"2023-07-28T09:32:44","guid":{"rendered":"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/"},"modified":"2023-07-28T09:32:44","modified_gmt":"2023-07-28T09:32:44","slug":"converteer-een-string-naar-zwevende-pandas","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/","title":{"rendered":"Hoe tekenreeksen te converteren naar zwevende panden in panda's"},"content":{"rendered":"

<\/p>\n

\n

Je kunt de volgende methoden gebruiken om een string zo te converteren dat deze in panda’s zweeft:<\/span><\/p>\n

Methode 1: Converteer enkele kolom naar zwevend<\/strong><\/span><\/p>\n

 #convert \"assists\" column from string to float<\/span>\ndf[' assists<\/span> '] = df[' assists<\/span> ']. astype<\/span> (float)\n<\/strong><\/pre>\n
 Methode 2: Converteer meerdere kolommen naar zwevend<\/strong><\/span><\/p>\n
 #convert both \"assists\" and \"rebounds\" from strings to floats\n<\/span>df[[' assists<\/span> ', ' rebounds<\/span> ']] = df[[' assists<\/span> ', ' rebounds<\/span> ']]. astype<\/span> (float)<\/strong><\/pre>\n
 Methode 3: Converteer alle kolommen naar zwevend<\/strong><\/span><\/p>\n
 #convert all columns to float\n<\/span>df = df. astype<\/span> (float)<\/strong><\/pre>\n
 De volgende voorbeelden laten zien hoe u elke methode in de praktijk kunt gebruiken met de volgende panda’s DataFrame:<\/span><\/p>\n
 import<\/span> numpy as<\/span> np\nimport<\/span> pandas as<\/span> pd\n\n#createDataFrame<\/span>\ndf = pd. DataFrame<\/span> ({' points<\/span> ': [np.nan, 12, 15, 14, 19],\n                   ' assists<\/span> ': ['5', np.nan, '7', '9', '12'],\n                   ' rebounds<\/span> ': ['11', '8', '10', '6', '6']})  \n\n#view DataFrame\n<\/span>df\n\n \tpoints assists rebounds\n0 NaN 5.0 11\n1 12.0 NaN 8\n2 15.0 7.0 10\n3 14.0 9.0 6\n4 19.0 12.0 6\n\n#view column data types\n<\/span>df. dtypes\n\nfloat64 points\nassists object\nrebound object\ndtype:object<\/span><\/span><\/strong><\/pre>\n
 Voorbeeld 1: Converteer een enkele kolom naar een float<\/strong><\/span><\/h2>\n
 De volgende syntaxis laat zien hoe u de helperkolom<\/strong> van een tekenreeks naar een float converteert:<\/span><\/p>\n
 #convert \"assists\" from string to float<\/span>\ndf[' assists<\/span> '] = df[' assists<\/span> ']. astype<\/span> (float)\n\n#view column data types<\/span>\ndf. dtypes<\/span>\n\nfloat64 points\nassist float64\nrebound object\ndtype:object\n<\/strong><\/pre>\n
 Voorbeeld 2: Converteer meerdere kolommen naar zwevend<\/strong><\/span><\/h2>\n
 De volgende syntaxis laat zien hoe u helper-<\/strong> en bounce-<\/strong> kolommen converteert van tekenreeksen naar floats:<\/span><\/p>\n
 #convert both \"assists\" and \"rebounds\" from strings to floats\n<\/span>df[[' assists<\/span> ', ' rebounds<\/span> ']] = df[[' assists<\/span> ', ' rebounds<\/span> ']]. astype<\/span> (float)\n\n#view column data types\n<\/span>df. dtypes\n\n<\/span>float64 points\nassist float64\nrebounds float64\ndtype:object\n<\/strong><\/pre>\n
 Voorbeeld 3: Converteer alle kolommen naar zwevend<\/strong><\/span><\/h2>\n
 De volgende syntaxis laat zien hoe u alle kolommen in het DataFrame naar floats converteert:<\/span><\/p>\n
 #convert all columns to float\n<\/span>df = df. astype<\/span> (float)\n\n#view column data types\n<\/span>df. dtypes\n\n<\/span>float64 points\nassist float64\nrebounds float64\ndtype:object<\/strong><\/pre>\n
 Bonus: converteer string naar float en vul NaN-waarden in<\/strong><\/span><\/h2>\n
 De volgende syntaxis laat zien hoe u de helperkolom<\/strong> van string naar float converteert en tegelijkertijd de NaN-waarden met nullen opvult:<\/span><\/p>\n
 #convert \"assists\" from string to float and fill in NaN values with zeros\n<\/span>df[' assists<\/span> '] = df[' assists<\/span> ']. astype<\/span> (float). fillna<\/span> (0)\n\n#view DataFrame\n<\/span>df\n<\/span>\n        points assists rebounds\n0 NaN 5.0 11\n1 12.0 0.0 8\n2 15.0 7.0 10\n3 14.0 9.0 6\n4 19.0 12.0 6<\/strong><\/pre>\n
 Aanvullende bronnen<\/strong><\/span><\/h2>\n
 In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende taken in panda’s kunt uitvoeren:<\/p>\n
 Panda’s: een object naar een geheel getal converteren<\/a>
Panda’s: Hoe floats naar gehele getallen te converteren<\/a>
 Panda’s: specifieke kolommen converteren naar NumPy-array<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Je kunt de volgende methoden gebruiken om een string zo te converteren dat deze in panda’s zweeft: Methode 1: Converteer enkele kolom naar zwevend #convert „assists“ column from string to float df[‚ assists ‚] = df[‚ assists ‚]. astype (float) Methode 2: Converteer meerdere kolommen naar zwevend #convert both „assists“ and „rebounds“ from strings to […]<\/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-897","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"\nHoe strings naar floats te converteren in Pandas \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"Een eenvoudige uitleg over het converteren van tekenreekskolommen in een Panda DataFrame naar zwevende kolommen.\" \/>\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\/nl\/converteer-een-string-naar-zwevende-pandas\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe strings naar floats te converteren in Pandas \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"Een eenvoudige uitleg over het converteren van tekenreekskolommen in een Panda DataFrame naar zwevende kolommen.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T09:32:44+00:00\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/\",\"url\":\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/\",\"name\":\"Hoe strings naar floats te converteren in Pandas \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-28T09:32:44+00:00\",\"dateModified\":\"2023-07-28T09:32:44+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"Een eenvoudige uitleg over het converteren van tekenreekskolommen in een Panda DataFrame naar zwevende kolommen.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/converteer-een-string-naar-zwevende-pandas\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe tekenreeksen te converteren naar zwevende panden in panda's\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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