如何在R中的n个字符后用三个点截断字符向量？

2023-06-21 07:46:04 507

在stringr包的str_trunc函数的帮助下，可以在n个字符后用三个点截断字符向量。例如，如果我们有一个字符向量x并且每个值包含10个字符，那么可以使用命令str_trunc(x,8)在5个字符后用三个点截断这些值。

示例1

> x1<-sample(c("abcbefgh","ijklmnopq","rstuvwxyz"),100,replace=TRUE)
> x1

输出结果

[1] "rstuvwxyz" "rstuvwxyz" "abcbefgh" "rstuvwxyz" "ijklmnopq" "ijklmnopq"
[7] "ijklmnopq" "rstuvwxyz" "rstuvwxyz" "rstuvwxyz" "rstuvwxyz" "abcbefgh"
[13] "rstuvwxyz" "abcbefgh" "abcbefgh" "ijklmnopq" "ijklmnopq" "ijklmnopq"
[19] "ijklmnopq" "rstuvwxyz" "rstuvwxyz" "abcbefgh" "abcbefgh" "ijklmnopq"
[25] "ijklmnopq" "ijklmnopq" "rstuvwxyz" "rstuvwxyz" "rstuvwxyz" "rstuvwxyz"
[31] "rstuvwxyz" "abcbefgh" "abcbefgh" "rstuvwxyz" "rstuvwxyz" "abcbefgh"
[37] "ijklmnopq" "abcbefgh" "rstuvwxyz" "ijklmnopq" "abcbefgh" "ijklmnopq"
[43] "rstuvwxyz" "ijklmnopq" "abcbefgh" "rstuvwxyz" "abcbefgh" "abcbefgh"
[49] "rstuvwxyz" "ijklmnopq" "rstuvwxyz" "ijklmnopq" "ijklmnopq" "ijklmnopq"
[55] "rstuvwxyz" "ijklmnopq" "abcbefgh" "rstuvwxyz" "ijklmnopq" "ijklmnopq"
[61] "abcbefgh" "abcbefgh" "rstuvwxyz" "abcbefgh" "ijklmnopq" "ijklmnopq"
[67] "rstuvwxyz" "abcbefgh" "abcbefgh" "abcbefgh" "ijklmnopq" "abcbefgh"
[73] "rstuvwxyz" "rstuvwxyz" "ijklmnopq" "ijklmnopq" "ijklmnopq" "ijklmnopq"
[79] "ijklmnopq" "rstuvwxyz" "rstuvwxyz" "abcbefgh" "abcbefgh" "ijklmnopq"
[85] "ijklmnopq" "abcbefgh" "abcbefgh" "rstuvwxyz" "abcbefgh" "abcbefgh"
[91] "rstuvwxyz" "rstuvwxyz" "ijklmnopq" "rstuvwxyz" "ijklmnopq" "ijklmnopq"
[97] "abcbefgh" "abcbefgh" "ijklmnopq" "ijklmnopq"

示例

> library(stringr)
> str_trunc(x1,5)

输出结果

[1] "rs..." "rs..." "ab..." "rs..." "ij..." "ij..." "ij..." "rs..." "rs..."
[10] "rs..." "rs..." "ab..." "rs..." "ab..." "ab..." "ij..." "ij..." "ij..."
[19] "ij..." "rs..." "rs..." "ab..." "ab..." "ij..." "ij..." "ij..." "rs..."
[28] "rs..." "rs..." "rs..." "rs..." "ab..." "ab..." "rs..." "rs..." "ab..."
[37] "ij..." "ab..." "rs..." "ij..." "ab..." "ij..." "rs..." "ij..." "ab..."
[46] "rs..." "ab..." "ab..." "rs..." "ij..." "rs..." "ij..." "ij..." "ij..."
[55] "rs..." "ij..." "ab..." "rs..." "ij..." "ij..." "ab..." "ab..." "rs..."
[64] "ab..." "ij..." "ij..." "rs..." "ab..." "ab..." "ab..." "ij..." "ab..."
[73] "rs..." "rs..." "ij..." "ij..." "ij..." "ij..." "ij..." "rs..." "rs..."
[82] "ab..." "ab..." "ij..." "ij..." "ab..." "ab..." "rs..." "ab..." "ab..."
[91] "rs..." "rs..." "ij..." "rs..." "ij..." "ij..." "ab..." "ab..." "ij..."
[100] "ij..."

示例

> str_trunc(x1,7)

输出结果

[1] "rstu..." "rstu..." "abcb..." "rstu..." "ijkl..." "ijkl..." "ijkl..."
[8] "rstu..." "rstu..." "rstu..." "rstu..." "abcb..." "rstu..." "abcb..."
[15] "abcb..." "ijkl..." "ijkl..." "ijkl..." "ijkl..." "rstu..." "rstu..."
[22] "abcb..." "abcb..." "ijkl..." "ijkl..." "ijkl..." "rstu..." "rstu..."
[29] "rstu..." "rstu..." "rstu..." "abcb..." "abcb..." "rstu..." "rstu..."
[36] "abcb..." "ijkl..." "abcb..." "rstu..." "ijkl..." "abcb..." "ijkl..."
[43] "rstu..." "ijkl..." "abcb..." "rstu..." "abcb..." "abcb..." "rstu..."
[50] "ijkl..." "rstu..." "ijkl..." "ijkl..." "ijkl..." "rstu..." "ijkl..."
[57] "abcb..." "rstu..." "ijkl..." "ijkl..." "abcb..." "abcb..." "rstu..."
[64] "abcb..." "ijkl..." "ijkl..." "rstu..." "abcb..." "abcb..." "abcb..."
[71] "ijkl..." "abcb..." "rstu..." "rstu..." "ijkl..." "ijkl..." "ijkl..."
[78] "ijkl..." "ijkl..." "rstu..." "rstu..." "abcb..." "abcb..." "ijkl..."
[85] "ijkl..." "abcb..." "abcb..." "rstu..." "abcb..." "abcb..." "rstu..."
[92] "rstu..." "ijkl..." "rstu..." "ijkl..." "ijkl..." "abcb..." "abcb..."
[99] "ijkl..." "ijkl..."

示例

> str_trunc(x1,8)

输出结果

[1] "rstuv..." "rstuv..." "abcbefgh" "rstuv..." "ijklm..." "ijklm..."
[7] "ijklm..." "rstuv..." "rstuv..." "rstuv..." "rstuv..." "abcbefgh"
[13] "rstuv..." "abcbefgh" "abcbefgh" "ijklm..." "ijklm..." "ijklm..."
[19] "ijklm..." "rstuv..." "rstuv..." "abcbefgh" "abcbefgh" "ijklm..."
[25] "ijklm..." "ijklm..." "rstuv..." "rstuv..." "rstuv..." "rstuv..."
[31] "rstuv..." "abcbefgh" "abcbefgh" "rstuv..." "rstuv..." "abcbefgh"
[37] "ijklm..." "abcbefgh" "rstuv..." "ijklm..." "abcbefgh" "ijklm..."
[43] "rstuv..." "ijklm..." "abcbefgh" "rstuv..." "abcbefgh" "abcbefgh"
[49] "rstuv..." "ijklm..." "rstuv..." "ijklm..." "ijklm..." "ijklm..."
[55] "rstuv..." "ijklm..." "abcbefgh" "rstuv..." "ijklm..." "ijklm..."
[61] "abcbefgh" "abcbefgh" "rstuv..." "abcbefgh" "ijklm..." "ijklm..."
[67] "rstuv..." "abcbefgh" "abcbefgh" "abcbefgh" "ijklm..." "abcbefgh"
[73] "rstuv..." "rstuv..." "ijklm..." "ijklm..." "ijklm..." "ijklm..."
[79] "ijklm..." "rstuv..." "rstuv..." "abcbefgh" "abcbefgh" "ijklm..."
[85] "ijklm..." "abcbefgh" "abcbefgh" "rstuv..." "abcbefgh" "abcbefgh"
[91] "rstuv..." "rstuv..." "ijklm..." "rstuv..." "ijklm..." "ijklm..."
[97] "abcbefgh" "abcbefgh" "ijklm..." "ijklm..."

例2

> x2<-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")
> x2

输出结果

[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

str_trunc(x2,5)

输出结果

[1] "Al..." "Al..." "Am..." "Ar..." "Ar..." "Ca..." "Co..." "Co..." "De..."
[10] "Di..." "Fl..." "Ge..." "Guam" "Ha..." "Idaho" "Il..." "In..." "Iowa"
[19] "Ka..." "Ke..." "Lo..." "Maine" "Ma..." "Ma..." "Mi..." "Mi..." "Mi..."
[28] "Mi..." "Mi..." "Mo..." "Ne..." "Ne..." "Ne..." "Ne..." "Ne..." "Ne..."
[37] "No..." "No..." "No..." "Ohio" "Ok..." "Or..." "Pe..." "Pu..." "Rh..."
[46] "So..." "So..." "Te..." "Texas" "U...." "Utah" "Ve..." "Vi..." "Wa..."
[55] "We..." "Wi..." "Wy..."

示例

> str_trunc(x2,4)

输出结果

[1] "A..." "A..." "A..." "A..." "A..." "C..." "C..." "C..." "D..." "D..."
[11] "F..." "G..." "Guam" "H..." "I..." "I..." "I..." "Iowa" "K..." "K..."
[21] "L..." "M..." "M..." "M..." "M..." "M..." "M..." "M..." "M..." "M..."
[31] "N..." "N..." "N..." "N..." "N..." "N..." "N..." "N..." "N..." "Ohio"
[41] "O..." "O..." "P..." "P..." "R..." "S..." "S..." "T..." "T..." "U..."
[51] "Utah" "V..." "V..." "W..." "W..." "W..." "W..."

如何在R中的n个字符后用三个点截断字符向量？

示例1

示例

示例

示例

例2

示例

示例

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