我有這個數據幀:如何基於列名稱對數據框進行子集劃分?
dput(df)
structure(list(Server = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = "servera", class = "factor"),
Date = structure(1:6, .Label = c("7/13/2017 15:01", "7/13/2017 15:02",
"7/13/2017 15:03", "7/13/2017 15:04", "7/13/2017 15:05",
"7/13/2017 15:06"), class = "factor"), Host_CPU = c(1.812950134,
2.288070679, 1.563278198, 1.925239563, 5.350669861, 2.612503052
), UsedMemPercent = c(38.19, 38.19, 38.19, 38.19, 38.19,
38.22), jvm1 = c(10.91, 11.13, 11.34, 11.56, 11.77, 11.99
), jvm2 = c(11.47, 11.7, 11.91, 12.13, 12.35, 12.57), jvm3 = c(75.65,
76.88, 56.93, 58.99, 65.29, 67.97), jvm4 = c(39.43, 40.86,
42.27, 43.71, 45.09, 45.33), jvm5 = c(27.42, 29.63, 31.02,
32.37, 33.72, 37.71)), .Names = c("Server", "Date", "Host_CPU",
"UsedMemPercent", "jvm1", "jvm2", "jvm3", "jvm4", "jvm5"), class = "data.frame", row.names = c(NA,
-6L))
我只希望能夠基於該變量的向量名子集這個數據幀:
select<-c("jvm3", "jvm4", "jvm5")
所以,我最後的DF應該像這個:
structure(list(Server = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = "servera", class = "factor"),
Date = structure(1:6, .Label = c("7/13/2017 15:01", "7/13/2017 15:02",
"7/13/2017 15:03", "7/13/2017 15:04", "7/13/2017 15:05",
"7/13/2017 15:06"), class = "factor"), Host_CPU = c(1.812950134,
2.288070679, 1.563278198, 1.925239563, 5.350669861, 2.612503052
), UsedMemPercent = c(38.19, 38.19, 38.19, 38.19, 38.19,
38.22), jvm3 = c(75.65, 76.88, 56.93, 58.99, 65.29, 67.97
), jvm4 = c(39.43, 40.86, 42.27, 43.71, 45.09, 45.33), jvm5 = c(27.42,
29.63, 31.02, 32.37, 33.72, 37.71)), .Names = c("Server",
"Date", "Host_CPU", "UsedMemPercent", "jvm3", "jvm4", "jvm5"), class = "data.frame", row.names = c(NA,
-6L))
有什麼想法嗎?
解決的辦法是:'DF [選擇]' –
'DF [C( 「服務器」, 「日期」, 「Host_CPU」, 「UsedMemPercent」,選擇)]'。或者,您可以使用'df [,c(「Server」, 「Date」,「Host_CPU」,「UsedMemPercent」,select)]'。或者'子集(select = c(「Server」,「Date」,「Host_CPU」,「UsedMemPercent」,select))'。有關詳細信息,請參閱'?subset'。或'?['。 – Gregor
請注意,非常感謝您採取額外的措施將dput的輸出修改爲可直接粘貼到R中的內容。因此,如果你將它粘貼到'your_data < - {在這裏插入dput輸出}' – Dason