How to convert the repeated elements of strings in a vector to unique elements in R?
When we have repeated elements of strings and we want to use them as factor levels then it is okay but if we want to treat them individually then it is better to make each value a unique element. To do this, we can use make.unique function. For example, if we have a vector x that contains repeated string values then to make them unique, we can use make.unique(x).
Example
Live Demo
x1<-sample(letters[1:4],10,replace=TRUE) x1
output
[1] "a" "c" "b" "a" "d" "d" "b" "b" "c" "c"
Example
make.unique(x1)
output
[1] "a" "b" "c" "c.1" "a.1" "b.1" "a.2" "b.2" "d" "a.3"
Example
Live Demo
x2<-sample(letters[1:4],120,replace=TRUE) x2
output
[1] "d" "a" "a" "b" "a" "c" "b" "c" "b" "a" "d" "d" "b" "d" "a" "c" "a" "d"
[19] "c" "c" "c" "a" "a" "d" "c" "a" "d" "c" "c" "d" "c" "a" "d" "c" "c" "b"
[37] "a" "c" "c" "d" "d" "a" "a" "d" "d" "d" "c" "b" "d" "b" "c" "d" "a" "c"
[55] "a" "c" "d" "b" "a" "d" "d" "a" "b" "d" "b" "d" "a" "b" "b" "c" "b" "a"
[73] "d" "b" "d" "b" "c" "b" "d" "a" "c" "c" "c" "c" "b" "b" "c" "a" "d" "d"
[91] "b" "c" "b" "d" "a" "a" "d" "a" "b" "c" "c" "a" "a" "a" "c" "a" "d" "d"
[109] "d" "c" "a" "d" "d" "b" "a" "a" "a" "c" "a" "b"
Example
make.unique(x2)
output
[1] "d" "c" "b" "c.1" "a" "d.1" "a.1" "c.2" "d.2" "c.3"
[11] "a.2" "d.3" "c.4" "a.3" "d.4" "c.5" "c.6" "c.7" "a.4" "a.5"
[21] "b.1" "c.8" "d.5" "a.6" "c.9" "b.2" "b.3" "c.10" "a.7" "a.8"
[31] "a.9" "d.6" "a.10" "d.7" "c.11" "b.4" "b.5" "b.6" "c.12" "d.8"
[41] "d.9" "b.7" "c.13" "a.11" "a.12" "d.10" "b.8" "a.13" "c.14" "a.14"
[51] "a.15" "c.15" "d.11" "d.12" "d.13" "b.9" "d.14" "d.15" "c.16" "a.16"
[61] "b.10" "d.16" "a.17" "a.18" "d.17" "b.11" "c.17" "b.12" "b.13" "c.18"
[71] "c.19" "b.14" "c.20" "a.19" "a.20" "d.18" "a.21" "a.22" "a.23" "d.19"
[81] "d.20" "c.21" "b.15" "b.16" "d.21" "b.17" "c.22" "a.24" "a.25" "b.18"
[91] "a.26" "c.23" "d.22" "d.23" "d.24" "c.24" "b.19" "a.27" "b.20" "a.28"
[101] "d.25" "a.29" "b.21" "a.30" "c.25" "b.22" "a.31" "d.26" "d.27" "d.28"
[111] "c.26" "b.23" "d.29" "b.24" "c.27" "b.25" "d.30" "a.32" "b.26" "d.31"
Example
Live Demo
x3<-sample(LETTERS[1:10],100,replace=TRUE) x3
output
[1] "B" "H" "H" "E" "F" "E" "A" "I" "J" "D" "C" "A" "B" "A" "C" "J" "D" "C"
[19] "J" "G" "A" "D" "D" "F" "F" "G" "B" "F" "F" "D" "B" "I" "C" "F" "G" "F"
[37] "D" "J" "H" "C" "B" "G" "G" "E" "G" "B" "F" "A" "F" "I" "A" "J" "I" "E"
[55] "A" "H" "H" "A" "C" "J" "I" "B" "D" "I" "A" "E" "G" "E" "E" "J" "J" "G"
[73] "I" "J" "D" "I" "J" "E" "E" "G" "D" "J" "G" "E" "A" "B" "H" "B" "C" "C"
[91] "A" "J" "G" "I" "H" "J" "E" "E" "G" "C"
Example
make.unique(x3)
output
[1] "F" "J" "C" "I" "D" "J.1" "J.2" "J.3" "I.1" "F.1"
[11] "C.1" "F.2" "I.2" "I.3" "J.4" "B" "D.1" "F.3" "H" "F.4"
[21] "B.1" "D.2" "J.5" "D.3" "B.2" "A" "B.3" "F.5" "D.4" "A.1"
[31] "D.5" "J.6" "H.1" "J.7" "B.4" "I.4" "F.6" "F.7" "A.2" "I.5"
[41] "B.5" "C.2" "J.8" "C.3" "C.4" "A.3" "D.6" "B.6" "E" "C.5"
[51] "G" "J.9" "A.4" "H.2" "I.6" "J.10" "J.11" "C.6" "H.3" "G.1"
[61] "B.7" "C.7" "A.5" "F.8" "I.7" "H.4" "J.12" "E.1" "E.2" "E.3"
[71] "A.6" "J.13" "B.8" "A.7" "H.5" "F.9" "B.9" "B.10" "J.14" "F.10"
[81] "D.7" "E.4" "A.8" "F.11" "I.8" "G.2" "B.11" "J.15" "E.5" "J.16"
[91] "E.6" "H.6" "F.12" "C.8" "B.12" "E.7" "G.3" "E.8" "G.4" "A.9"
Example
Live Demo
x4<-sample(c("USA","CHINA","INDIA","CANADA","RUSSIA"),50,replace=TRUE)
x4output
[1] "INDIA" "CHINA" "INDIA" "CANADA" "INDIA" "CANADA" "INDIA" "CANADA"
[9] "INDIA" "CANADA" "CANADA" "CHINA" "CANADA" "CANADA" "INDIA" "CANADA"
[17] "CHINA" "INDIA" "CANADA" "RUSSIA" "INDIA" "CANADA" "CANADA" "CHINA"
[25] "CANADA" "CHINA" "RUSSIA" "RUSSIA" "INDIA" "CHINA" "CANADA" "USA"
[33] "USA" "USA" "RUSSIA" "USA" "CANADA" "CHINA" "USA" "RUSSIA"
[41] "CHINA" "RUSSIA" "RUSSIA" "USA" "CHINA" "USA" "USA" "RUSSIA"
[49] "CHINA" "CANADA"
Example
Live Demo
x5<-sample(c("tutor","e-learning","programming","tech"),60,replace=TRUE)
x5output
[1] "tutor" "tutor" "programming" "tutor" "tech"
[6] "tutor" "tech" "tech" "tutor" "tech"
[11] "tutor" "tutor" "e-learning" "e-learning" "tech"
[16] "e-learning" "tutor" "e-learning" "tutor" "tech"
[21] "tutor" "programming" "e-learning" "tech" "tutor"
[26] "e-learning" "tutor" "e-learning" "tutor" "e-learning"
[31] "tech" "programming" "programming" "tutor" "programming"
[36] "tech" "tech" "programming" "programming" "programming"
[41] "e-learning" "e-learning" "e-learning" "e-learning" "tech"
[46] "tech" "programming" "tutor" "e-learning" "e-learning"
[51] "programming" "e-learning" "tutor" "e-learning" "tutor"
[56] "e-learning" "programming" "e-learning" "tutor" "programming"
Example
make.unique(x5)
output
[1] "programming" "tech" "programming.1" "tutor"
[5] "e-learning" "programming.2" "e-learning.1" "programming.3"
[9] "tutor.1" "tech.1" "tech.2" "programming.4"
[13] "tech.3" "programming.5" "e-learning.2" "tutor.2"
[17] "programming.6" "programming.7" "e-learning.3" "tech.4"
[21] "tutor.3" "tech.5" "programming.8" "e-learning.4"
[25] "e-learning.5" "tech.6" "programming.9" "programming.10"
[29] "programming.11" "tech.7" "programming.12" "tech.8"
[33] "e-learning.6" "tutor.4" "programming.13" "e-learning.7"
[37] "e-learning.8" "tutor.5" "e-learning.9" "tutor.6"
[41] "tutor.7" "e-learning.10" "tech.9" "e-learning.11"
[45] "tutor.8" "e-learning.12" "programming.14" "e-learning.13"
[49] "e-learning.14" "programming.15" "tutor.9" "e-learning.15"
[53] "programming.16" "programming.17" "tutor.10" "tutor.11"
[57] "tech.10" "tech.11" "programming.18" "programming.19"
Published on 14-Oct-2020 11:19:35
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