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法律研究如何在 R 中僅刪除字串向量的最後一個字元？
有時字串向量在末尾或開頭包含無用的字元，這樣的字串是沒有意義的，也可能是字串本身是有意義的，但是不需要那裡有拼寫錯誤。在這種情況下，我們需要刪除這些無用的字元。這可以透過使用 gsub 函式來完成。
示例 1
x1<−"Tutorialspoint is an E-learning website and one of the biggest websites in the worlds"
gsub('.{1}$','',x1)輸出
[1] "Tutorialspoint is an E-learning website and one of the biggest websites in the world"
示例 2
x2<−c("Alabamaa", "Alaskaa", "American Samoaa", "Arizonaa", "Arkansass", "Californiaa", "Coloradoo", "Connecticutt", "Delawaree", "District of Columbiaa", "Floridaa", "Georgiaa", "Guamm", "Hawaiii", "Idahoo", "Illinoiss", "Indianaa", "Iowaa", "Kansass", "Kentuckyy", "Louisianaa", "Mainee", "Marylandd", "Massachusettss", "Michigann", "Minnesotaa", "Minor Outlying Islandss", "Mississippii", "Missourii", "Montanaa", "Nebraskaa", "Nevadaa", "New Hampshiree", "New Jerseyy", "New Mexicoo", "New Yorkk", "North Carolinaa", "North Dakotaa", "Northern Mariana Islandss", "Ohioo", "Oklahomaa", "Oregonn", "Pennsylvaniaa", "Puerto Ricoo", "Rhode Islandd", "South Carolinaa", "South Dakotaa", "Tennesseee", "Texasx", "U.S. Virgin Islandss", "Utahh", "Vermontt", "Virginiaa", "Washingtonn", "West Virginiaa", "Wisconsinn", "Wyomingg")
x2輸出
[1] "Alabamaa" "Alaskaa" [3] "American Samoaa" "Arizonaa" [5] "Arkansass" "Californiaa" [7] "Coloradoo" "Connecticutt" [9] "Delawaree" "District of Columbiaa" [11] "Floridaa" "Georgiaa" [13] "Guamm" "Hawaiii" [15] "Idahoo" "Illinoiss" [17] "Indianaa" "Iowaa" [19] "Kansass" "Kentuckyy" [21] "Louisianaa" "Mainee" [23] "Marylandd" "Massachusettss" [25] "Michigann" "Minnesotaa" [27] "Minor Outlying Islandss" "Mississippii" [29] "Missourii" "Montanaa" [31] "Nebraskaa" "Nevadaa" [33] "New Hampshiree" "New Jerseyy" [35] "New Mexicoo" "New Yorkk" [37] "North Carolinaa" "North Dakotaa" [39] "Northern Mariana Islandss" "Ohioo" [41] "Oklahomaa" "Oregonn" [43] "Pennsylvaniaa" "Puerto Ricoo" [45] "Rhode Islandd" "South Carolinaa" [47] "South Dakotaa" "Tennesseee" [49] "Texasx" "U.S. Virgin Islandss" [51] "Utahh" "Vermontt" [53] "Virginiaa" "Washingtonn" [55] "West Virginiaa" "Wisconsinn" [57] "Wyomingg"
示例
gsub('.{1}$','',x2)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 3
x3<−c("AKK", "ALL", "ARR", "ASS", "AZZ", "CAA", "COO", "CTT", "DCC", "DEE", "FFLL", "GAA", "GUU", "HII", "IAA", "IDD", "ILL", "INN", "KSS", "KYY", "LAA", "MAA", "MDD", "MEE", "MII", "MNN", "MOO", "MPP", "MSS", "MTT", "NCC", "NDD", "NEE", "NHH", "NJJ", "NMM", "NVV", "NYY", "OHH", "OKK", "ORR", "PAA", "PRR", "RII", "SCC", "SDD", "TNN", "TXX", "UMM", "UTT", "VAA", "VII", "VTT", "WAA", "WII", "WVV", "WYY")
x3
[1] "AKK" "ALL" "ARR" "ASS" "AZZ" "CAA" "COO" "CTT" "DCC" "DEE"
[11] "FFLL" "GAA" "GUU" "HII" "IAA" "IDD" "ILL" "INN" "KSS" "KYY"
[21] "LAA" "MAA" "MDD" "MEE" "MII" "MNN" "MOO" "MPP" "MSS" "MTT"
[31] "NCC" "NDD" "NEE" "NHH" "NJJ" "NMM" "NVV" "NYY" "OHH" "OKK"
[41] "ORR" "PAA" "PRR" "RII" "SCC" "SDD" "TNN" "TXX" "UMM" "UTT"
[51] "VAA" "VII" "VTT" "WAA" "WII" "WVV" "WYY"
gsub('.{1}$','',x3)
[1] "AK" "AL" "AR" "AS" "AZ" "CA" "CO" "CT" "DC" "DE" "FFL" "GA"
[13] "GU" "HI" "IA" "ID" "IL" "IN" "KS" "KY" "LA" "MA" "MD" "ME"
[25] "MI" "MN" "MO" "MP" "MS" "MT" "NC" "ND" "NE" "NH" "NJ" "NM"
[37] "NV" "NY" "OH" "OK" "OR" "PA" "PR" "RI" "SC" "SD" "TN" "TX"
[49] "UM" "UT" "VA" "VI" "VT" "WA" "WI" "WV" "WY"
更新於： 09-Feb-2021
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