R：在數據幀

Question

訂購特定瓦爾我有變量阿爾法通祖魯一個數據幀，但不是在任何特定的順序（例如布拉沃，揚克，查理，等）。我想按字母順序排列威爾斯三角洲威士忌（20個變種），並保持原狀。

例如無序DF colnames（操作前）：Zulu, Bravo, Alpha, Delta, Kilo, Tango, .... Whiskey, Yankee, X-Ray

例如訂購DF colnames（手術後）：Zulu, Bravo, Alpha, #Start ordered section# Delta, Echo, Fox, Golf, .... Whiskey, #End ordered section# Yankee, X-Ray

我想我接近使用order命令，但我失去了一些東西......

DF <- DF[ , order(which(names(DF) == 'Delta') : which(names(mitch) == 'Whiskey')) ]

Answer 1

下面是我工作：

# Create list of variables to sort 
names.DF <- names(DF) 

# Find just the variables between the 4th variable ('Delta') and the 23rd variable ('Whiskey') 
ord <- names.DF %in% sort(names.DF)[(which(names.DF=='Delta')):(which(names.DF=='Whiskey'))] 

# Replace just the desired variables with the properly sorted variables 
names.DF[ord] <- sort(names.DF[ord]) 

# Use the sorted list to sort the variables in the dataframe 
DF <- DF[,names.DF] 

只要你想

該解決方案將責令變量。它還可以處理Alpha，Bravo，Charlie，X-ray，Yankee和Zulu與您想要訂購的變量混合在一起的情況，而不僅僅是兩端。例如，

Zulu, Alpha, X-ray, Echo, Whiskey, Delta, Golf, Bravo, Charlie, Yankee

成爲

Zulu, Alpha, X-ray, Delta, Echo, Golf, Whiskey, Bravo, Charlie, Yankee

和

Echo, Zulu, Whiskey, Delta, Alpha, X-ray, Bravo, Charlie, Golf, Yankee

成爲

Delta, Zulu, Echo, Golf, Alpha, X-ray, Bravo, Charlie, Whiskey, Yankee