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a = 1:10
# we just want to have the 4th item from this vector a into b
b = a[4]
# we just want to have all but 4th item from this vector a into c
c = a[-4]
# we just want to have the 1st to 4th item from this vector a into d
d = a[1:4]
#or
d = a[c(1,2,3,4)]
# we just want to have the all but 1st to 4th item from this vector a into e
e = a[-(1:4)]
#or
e = a[-c(1,2,3,4)]
Selecting a particular part of a vector
# Suppose we have a vector “a”a = 1:10
# we just want to have the 4th item from this vector a into b
b = a[4]
# we just want to have all but 4th item from this vector a into c
c = a[-4]
# we just want to have the 1st to 4th item from this vector a into d
d = a[1:4]
#or
d = a[c(1,2,3,4)]
# we just want to have the all but 1st to 4th item from this vector a into e
e = a[-(1:4)]
#or
e = a[-c(1,2,3,4)]
Modifying a vector
# Suppose a have a vector name
name = c("Rajat" , "Vinod","Shobhit" , "Harish")
# Suppose we want to change the fourth element from Harish to Varun, we simply do it by
name[4] = "Varun"
# you can check it by executing
name
# Suppose we want to change the fourth element from Harish to missing value, use NA
name[4] = NA
#Now to check all the non-missing values we can Use
name[!is.na(name)]
Let's understand now, the another form of objects in R : Matrix, Data Frames and List
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