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How to subset a named vector based on names in R?
To subset a named vector based on names, we can follow the below steps −
- Create a named vector.
- Subset the vector using grepl.
Create the named vector
Let’s create a name vector as shown below −
V<-round(rnorm(150),2) names(V)<-sample(LETTERS[1:26],150,replace=TRUE) V
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
Output
N F A B T B R T X E T H P 0.96 0.96 -0.57 -1.48 -1.27 1.47 -1.36 -0.48 1.78 0.49 1.19 0.94 -1.26 B X Y O C V U E A F H M T 0.89 2.60 -1.76 0.72 -0.77 0.59 -0.24 -0.79 -0.43 0.86 -0.43 1.90 0.91 I N K H N A E E M X D K E -0.52 1.28 0.39 1.21 -0.16 -1.15 -1.96 -0.09 1.26 -0.54 0.35 -0.11 0.09 X K B R V K Z B I J M Q C 1.28 0.07 -0.22 2.25 0.31 -0.45 0.31 1.22 0.80 -0.65 0.49 -1.14 -0.95 P N H V E W R E L L X Q P -0.12 0.76 -0.69 -0.19 1.29 -0.57 -0.67 -0.30 0.04 -0.18 0.19 -1.22 -0.81 Y E Z G G Z Q E C A Y J M -0.41 -1.39 0.14 -0.06 -0.17 -1.57 -1.64 1.20 -1.21 -0.27 0.85 -0.62 -0.27 L F K A X M N H V E N W B 1.09 0.07 -0.70 0.64 -0.61 0.38 -0.77 0.34 0.22 0.23 0.96 -0.85 -0.94 X U F U E M X R U B V D Z 2.16 -0.79 1.83 -0.09 1.01 0.77 2.29 0.12 1.71 -0.51 -0.85 1.15 -0.32 D V O I I A B Q N I U F B -1.85 -0.74 -2.21 1.16 0.09 0.03 -0.39 0.50 2.51 1.33 -1.02 -0.36 0.27 F A C Y W G L N A P J J K 1.10 1.04 -0.90 1.29 0.52 -0.22 -1.03 -0.84 -0.24 1.75 -1.38 -0.64 -0.69 E D M P G O A J Z B C S O -1.22 -1.02 1.31 -1.61 -0.71 -0.38 0.15 -0.62 -1.50 -0.46 1.08 -1.45 -0.89 Z O J X W F W -0.44 0.33 -0.13 0.41 -0.93 2.82 1.05
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with A −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^A",names(V))]Output
A A A A A A A A A -0.57 -0.43 -1.15 -0.27 0.64 0.03 1.04 -0.24 0.15
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with B −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^B",names(V))]Output
B B B B B B B B B B -1.48 1.47 0.89 -0.22 1.22 -0.94 -0.51 -0.39 0.27 -0.46
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with C −
Example
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^C",names(V))]Output
C C C C C -0.77 -0.95 -1.21 -0.90 1.08
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with D −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^D",names(V))]Output
D D D D 0.35 1.15 -1.85 -1.02
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with E −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^E",names(V))]Output
E E E E E E E E E E E E 0.49 -0.79 -1.96 -0.09 0.09 1.29 -0.30 -1.39 1.20 0.23 1.01 -1.22
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with F −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^F",names(V))]Output
F F F F F F F 0.96 0.86 0.07 1.83 -0.36 1.10 2.82
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with G −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^G",names(V))]Output
G G G G -0.06 -0.17 -0.22 -0.71
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with H −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^H",names(V))]Output
H H H H H 0.94 -0.43 1.21 -0.69 0.34
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with I −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^I",names(V))]Output
I I I I I -0.52 0.80 1.16 0.09 1.33
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with J −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^J",names(V))]Output
J J J J J J -0.65 -0.62 -1.38 -0.64 -0.62 -0.13
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with K −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^K",names(V))]Output
K K K K K K 0.39 -0.11 0.07 -0.45 -0.70 -0.69
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with L −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^L",names(V))]Output
L L L L 0.04 -0.18 1.09 -1.03
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with M −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^M",names(V))]Output
M M M M M M M 1.90 1.26 0.49 -0.27 0.38 0.77 1.31
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with N −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^N",names(V))]Output
N N N N N N N N 0.96 1.28 -0.16 0.76 -0.77 0.96 2.51 -0.84
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with O −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^O",names(V))]Output
O O O O O 0.72 -2.21 -0.38 -0.89 0.33
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with P −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^P",names(V))]Output
P P P P P -1.26 -0.12 -0.81 1.75 -1.61
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with Q −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^Q",names(V))]Output
Q Q Q Q -1.14 -1.22 -1.64 0.50
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with R −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^R",names(V))]Output
R R R R -1.36 2.25 -0.67 0.12
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with S −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^S",names(V))]Output
S -1.45
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with T −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^T",names(V))]Output
T T T T -1.27 -0.48 1.19 0.91
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with U −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^U",names(V))]Output
U U U U U -0.24 -0.79 -0.09 1.71 -1.02
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with V −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^V",names(V))]Output
V V V V V V 0.59 0.31 -0.19 0.22 -0.85 -0.74
Subset the vector V based on the names of element
Use grep function to subset vector values starting with W −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^W",names(V))]Output
W W W W W -0.57 -0.85 0.52 -0.93 1.05
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with X −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^X",names(V))]Output
X X X X X X X X X 1.78 2.60 -0.54 1.28 0.19 -0.61 2.16 2.29 0.41
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with Y −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^Y",names(V))]Output
Y Y Y Y -1.76 -0.41 0.85 1.29
Subset the vector V based on the names of element
Use grepl function to subset vector values starting with Z −
V<-round(rnorm(150),2)
names(V)<-sample(LETTERS[1:26],150,replace=TRUE)
V[grepl("^Z",names(V))]Output
Z Z Z Z Z Z 0.31 0.14 -1.57 -0.32 -1.50 -0.44
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