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法律研究如何在 R 中找到兩個字串向量之間的不同元素？
就像數值向量一樣，如果存在，我們可以在兩個字串向量之間找到不同的元素。為此，我們可以使用 setdiff 函式。例如，如果我們有一個包含 a、b、c、d、e、f 的向量 V1 和另一個包含 a、e、h、k、l、p、r、u、v、w 的向量 V2，那麼我們可以透過 setdiff(V1,V2) 找到這兩個向量之間的不同元素。
示例
x1<-LETTERS[1:26] x1
輸出
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" [20] "T" "U" "V" "W" "X" "Y" "Z"
示例
x2<-LETTERS[5:21] x2
輸出
[1] "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" "T" "U" setdiff(x1,x2) [1] "A" "B" "C" "D" "V" "W" "X" "Y" "Z"
示例
x3<-c("Alabama", "Alaska", "American Samoa", "Arizona", "Arkansas", "California", "Colorado", "Connecticut", "Delaware", "District of Columbia", "Florida", "Georgia", "Guam", "Hawaii", "Idaho", "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky", "Louisiana", "Maine", "Maryland", "Massachusetts", "Michigan", "Minnesota", "Minor Outlying Islands", "Mississippi", "Missouri", "Montana", "Nebraska", "Nevada", "New Hampshire", "New Jersey", "New Mexico", "New York", "North Carolina", "North Dakota", "Northern Mariana Islands", "Ohio", "Oklahoma", "Oregon", "Pennsylvania", "Puerto Rico", "Rhode Island", "South Carolina", "South Dakota", "Tennessee", "Texas", "U.S. Virgin Islands", "Utah", "Vermont", "Virginia", "Washington", "West Virginia", "Wisconsin", "Wyoming")
x3輸出
[1] "Alabama" "Alaska" [3] "American Samoa" "Arizona" [5] "Arkansas" "California" [7] "Colorado" "Connecticut" [9] "Delaware" "District of Columbia" [11] "Florida" "Georgia" [13] "Guam" "Hawaii" [15] "Idaho" "Illinois" [17] "Indiana" "Iowa" [19] "Kansas" "Kentucky" [21] "Louisiana" "Maine" [23] "Maryland" "Massachusetts" [25] "Michigan" "Minnesota" [27] "Minor Outlying Islands" "Mississippi" [29] "Missouri" "Montana" [31] "Nebraska" "Nevada" [33] "New Hampshire" "New Jersey" [35] "New Mexico" "New York" [37] "North Carolina" "North Dakota" [39] "Northern Mariana Islands" "Ohio" [41] "Oklahoma" "Oregon" [43] "Pennsylvania" "Puerto Rico" [45] "Rhode Island" "South Carolina" [47] "South Dakota" "Tennessee" [49] "Texas" "U.S. Virgin Islands" [51] "Utah" "Vermont" [53] "Virginia" "Washington" [55] "West Virginia" "Wisconsin" [57] "Wyoming"
示例
x4<-c("Alabama", "Alaska", "American Samoa", "Arizona", "Arkansas", "California","Florida", "Georgia", "Guam", "Hawaii", "Idaho", "Louisiana", "Maine", "Maryland", "Mississippi", "Missouri", "New Jersey", "New Mexico", "New York", "North Carolina", "Puerto Rico", "Rhode Island", "South Carolina", "South Dakota", "Tennessee")
x4輸出
[1] "Alabama" "Alaska" "American Samoa" "Arizona" [5] "Arkansas" "California" "Florida" "Georgia" [9] "Guam" "Hawaii" "Idaho" "Louisiana" [13] "Maine" "Maryland" "Mississippi" "Missouri" [17] "New Jersey" "New Mexico" "New York" "North Carolina" [21] "Puerto Rico" "Rhode Island" "South Carolina" "South Dakota" [25] "Tennessee" setdiff(x3,x4) [1] "Colorado" "Connecticut" [3] "Delaware" "District of Columbia" [5] "Illinois" "Indiana" [7] "Iowa" "Kansas" [9] "Kentucky" "Massachusetts" [11] "Michigan" "Minnesota" [13] "Minor Outlying Islands" "Montana" [15] "Nebraska" "Nevada" [17] "New Hampshire" "North Dakota" [19] "Northern Mariana Islands" "Ohio" [21] "Oklahoma" "Oregon" [23] "Pennsylvania" "Texas" [25] "U.S. Virgin Islands" "Utah" [27] "Vermont" "Virginia" [29] "Washington" "West Virginia" [31] "Wisconsin" "Wyoming"
示例
x5<-c("AK", "AL", "AR", "AS", "AZ", "CA", "CO", "CT", "DC", "DE", "FL", "GA", "GU", "HI", "IA", "ID", "IL", "IN", "KS", "KY", "LA", "MA", "MD", "ME", "MI", "MN", "MO", "MP", "MS", "MT", "NC", "ND", "NE", "NH", "NJ", "NM", "NV", "NY", "OH", "OK", "OR", "PA", "PR", "RI", "SC", "SD", "TN", "TX", "UM", "UT", "VA", "VI", "VT", "WA", "WI", "WV", "WY")
x5輸出
[1] "AK" "AL" "AR" "AS" "AZ" "CA" "CO" "CT" "DC" "DE" "FL" "GA" "GU" "HI" "IA" [16] "ID" "IL" "IN" "KS" "KY" "LA" "MA" "MD" "ME" "MI" "MN" "MO" "MP" "MS" "MT" [31] "NC" "ND" "NE" "NH" "NJ" "NM" "NV" "NY" "OH" "OK" "OR" "PA" "PR" "RI" "SC" [46] "SD" "TN" "TX" "UM" "UT" "VA" "VI" "VT" "WA" "WI" "WV" "WY"
示例
x6<-c("AK", "CA", "CO", "CT", "HI", "IA", "ID", "IL", "MD", "ME", "MI", "MN", "MO", "MP", "MS", "MT", "NC", "ND", "NE", "NH", "OR", "PA", "PR", "RI", "SC")
x6輸出
[1] "AK" "CA" "CO" "CT" "HI" "IA" "ID" "IL" "MD" "ME" "MI" "MN" "MO" "MP" "MS" [16] "MT" "NC" "ND" "NE" "NH" "OR" "PA" "PR" "RI" "SC"
更新時間：08-Oct-2020
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