{"id":1601,"date":"2023-07-25T16:56:36","date_gmt":"2023-07-25T16:56:36","guid":{"rendered":"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/"},"modified":"2023-07-25T16:56:36","modified_gmt":"2023-07-25T16:56:36","slug":"panda-roznica-miedzy-rzedami","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/","title":{"rendered":"Pandy: jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwiema liniami"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Mo\u017cesz u\u017cy\u0107 funkcji <strong>DataFrame.diff()<\/strong> , aby znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwoma wierszami w ramce DataFrame pandy.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ta funkcja u\u017cywa nast\u0119puj\u0105cej sk\u0142adni:<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">DataFrame.diff(okresy=1, o\u015b=0)<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\">Z\u0142oto:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>okresy:<\/strong> liczba poprzednich wierszy do obliczenia r\u00f3\u017cnicy.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>o\u015b:<\/strong> znajd\u017a r\u00f3\u017cnic\u0119 w wierszach (0) lub kolumnach (1).<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce wykorzysta\u0107 t\u0119 funkcj\u0119.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 1: Znajd\u017a r\u00f3\u017cnic\u0119 mi\u0119dzy ka\u017cdym poprzednim wierszem<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 DataFrame pand:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame<\/span>\ndf = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">period<\/span> ': [1, 2, 3, 4, 5, 6, 7, 8],\n                   ' <span style=\"color: #ff0000;\">sales<\/span> ': [12, 14, 15, 15, 18, 20, 19, 24],\n                   ' <span style=\"color: #ff0000;\">returns<\/span> ': [2, 2, 3, 3, 5, 4, 4, 6]})\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span>df\n\n\tperiod sales returns\n0 1 12 2\n1 2 14 2\n2 3 15 3\n3 4 15 3\n4 5 18 5\n5 6 20 4\n6 7 19 4\n7 8 24 6<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy ka\u017cdym bie\u017c\u0105cym wierszem ramki DataFrame a poprzednim wierszem:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#add new column to represent sales differences between each row<\/span>\ndf[' <span style=\"color: #ff0000;\">sales_diff<\/span> '] = df[' <span style=\"color: #ff0000;\">sales<\/span> ']. <span style=\"color: #3366ff;\">diff<\/span> ()\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span>df\n\n        period sales returns sales_diff\n0 1 12 2 NaN\n1 2 14 2 2.0\n2 3 15 3 1.0\n3 4 15 3 0.0\n4 5 18 5 3.0\n5 6 20 4 2.0\n6 7 19 4 -1.0\n7 8 24 6 5.0\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Zauwa\u017c, \u017ce mo\u017cemy r\u00f3wnie\u017c znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy kilkoma poprzednimi liniami. Na przyk\u0142ad poni\u017cszy kod pokazuje, jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy ka\u017cdym bie\u017c\u0105cym wierszem a wierszem, kt\u00f3ry pojawi\u0142 si\u0119 trzy wiersze wcze\u015bniej:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#add new column to represent sales differences between current row and 3 rows earlier<\/span>\ndf[' <span style=\"color: #ff0000;\">sales_diff<\/span> '] = df[' <span style=\"color: #ff0000;\">sales<\/span> ']. <span style=\"color: #3366ff;\">diff<\/span> (periods= <span style=\"color: #008000;\">3<\/span> )\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span>df\n\n        period sales returns sales_diff\n0 1 12 2 NaN\n1 2 14 2 NaN\n2 3 15 3 NaN\n3 4 15 3 3.0\n4 5 18 5 4.0\n5 6 20 4 5.0\n6 7 19 4 4.0\n7 8 24 6 6.0<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 2: Znajd\u017a r\u00f3\u017cnic\u0119 na podstawie warunku<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c filtrowa\u0107 ramk\u0119 DataFrame, aby wy\u015bwietli\u0107 wiersze, w kt\u00f3rych r\u00f3\u017cnica mi\u0119dzy bie\u017c\u0105cym wierszem a poprzednim wierszem jest mniejsza lub wi\u0119ksza ni\u017c okre\u015blona warto\u015b\u0107.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Na przyk\u0142ad poni\u017cszy kod zwraca tylko te wiersze, w kt\u00f3rych warto\u015b\u0107 bie\u017c\u0105cego wiersza jest <strong>mniejsza ni\u017c<\/strong> warto\u015b\u0107 poprzedniego wiersza:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame<\/span>\ndf = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">period<\/span> ': [1, 2, 3, 4, 5, 6, 7, 8],\n                   ' <span style=\"color: #ff0000;\">sales<\/span> ': [12, 14, 15, 13, 18, 20, 19, 24],\n                   ' <span style=\"color: #ff0000;\">returns<\/span> ': [2, 2, 3, 3, 5, 4, 4, 6]})\n\n<span style=\"color: #008080;\">#find difference between each current row and the previous row\n<\/span>df[' <span style=\"color: #ff0000;\">sales_diff<\/span> '] = df[' <span style=\"color: #ff0000;\">sales<\/span> ']. <span style=\"color: #3366ff;\">diff<\/span> ()\n\n<span style=\"color: #008080;\">#filter for rows where difference is less than zero\n<\/span>df = df[df[' <span style=\"color: #ff0000;\">sales_diff<\/span> ']&lt; <span style=\"color: #008000;\">0<\/span> ]\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span>df\n\n        period sales returns sales_diff\n3 4 13 3 -2.0\n6 7 19 4 -1.0<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pl\/pojedyncze-pandy,-wiele-kolumn\/\" target=\"_blank\" rel=\"noopener\">Jak znale\u017a\u0107 unikalne warto\u015bci w wielu kolumnach w Pandach<\/a><br \/> Jak filtrowa\u0107 ramk\u0119 danych Pandas wed\u0142ug warto\u015bci kolumn<br \/> <a href=\"https:\/\/statorials.org\/pl\/pandy-wybieraja-wiersze-wed\u0142ug-indeksu\/\" target=\"_blank\" rel=\"noopener\">Jak wybiera\u0107 wiersze wed\u0142ug indeksu w ramce danych Pandas<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mo\u017cesz u\u017cy\u0107 funkcji DataFrame.diff() , aby znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwoma wierszami w ramce DataFrame pandy. Ta funkcja u\u017cywa nast\u0119puj\u0105cej sk\u0142adni: DataFrame.diff(okresy=1, o\u015b=0) Z\u0142oto: okresy: liczba poprzednich wierszy do obliczenia r\u00f3\u017cnicy. o\u015b: znajd\u017a r\u00f3\u017cnic\u0119 w wierszach (0) lub kolumnach (1). Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce wykorzysta\u0107 t\u0119 funkcj\u0119. Przyk\u0142ad 1: Znajd\u017a r\u00f3\u017cnic\u0119 mi\u0119dzy ka\u017cdym poprzednim [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1601","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pandy: jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwiema liniami<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwoma wierszami w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\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\/pl\/panda-roznica-miedzy-rzedami\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pandy: jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwiema liniami\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwoma wierszami w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T16:56:36+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisane przez\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Szacowany czas czytania\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/\",\"url\":\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/\",\"name\":\"Pandy: jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwiema liniami\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-25T16:56:36+00:00\",\"dateModified\":\"2023-07-25T16:56:36+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwoma wierszami w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/panda-roznica-miedzy-rzedami\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pandy: jak znale\u017a\u0107 r\u00f3\u017cnic\u0119 mi\u0119dzy dwiema liniami\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pl\/#website\",\"url\":\"https:\/\/statorials.org\/pl\/\",\"name\":\"Statorials\",\"description\":\"Tw\u00f3j przewodnik po kompetencjach statystycznych!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pl-PL\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\",\"name\":\"Benjamin Anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pl-PL\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin Anderson\"},\"description\":\"Cze\u015b\u0107, jestem Benjamin i jestem emerytowanym profesorem statystyki, kt\u00f3ry zosta\u0142 oddanym nauczycielem Statorials. 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