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How to add a column in an R data frame with consecutive numbers?
Addition of a column with consecutive might have different objectives such as getting the sequence of numbers, representing serial numbers, representing ids, identification of each row, or a variable. We can use the sequence starting from any number up to the number of rows if we know the number of rows for this purpose.
Example1
Consider the below data frame:
> x1<-rnorm(20,5,1.12) > x2<-rnorm(20,5,0.34) > df1<-data.frame(x1,x2) > df1
Output
x1 x2 1 6.137898 5.203712 2 5.283467 5.057344 3 5.873749 4.907388 4 7.628762 5.012650 5 4.134700 4.988379 6 5.340686 4.684900 7 5.126999 4.821752 8 3.722762 4.974044 9 4.097969 5.284176 10 4.249122 4.503324 11 5.511502 5.355315 12 5.826045 4.853419 13 4.947602 5.512752 14 7.174369 5.320503 15 4.671888 5.100163 16 3.777945 4.893680 17 3.591266 4.715214 18 4.270032 4.776928 19 6.913433 4.828765 20 4.619279 5.138295
Adding a column of consecutive numbers:
Example
> df1$consecutive_numbers<-1:nrow(df1) > df1
Output
x1 x2 consecutive numbers 1 6.137898 5.203712 1 2 5.283467 5.057344 2 3 5.873749 4.907388 3 4 7.628762 5.012650 4 5 4.134700 4.988379 5 6 5.340686 4.684900 6 7 5.126999 4.821752 7 8 3.722762 4.974044 8 9 4.097969 5.284176 9 10 4.249122 4.503324 10 11 5.511502 5.355315 11 12 5.826045 4.853419 12 13 4.947602 5.512752 13 14 7.174369 5.320503 14 15 4.671888 5.100163 15 16 3.777945 4.893680 16 17 3.591266 4.715214 17 18 4.270032 4.776928 18 19 6.913433 4.828765 19 20 4.619279 5.138295 20
Example2
> y1<-rpois(20,5) > y2<-rpois(20,8) > df2<-data.frame(y1,y2) > df2
Output
y1 y2 1 4 7 2 11 7 3 5 5 4 3 8 5 6 5 6 4 8 7 6 6 8 2 10 9 1 8 10 6 6 11 6 5 12 2 10 13 4 3 14 1 12 15 5 9 16 4 8 17 5 8 18 4 2 19 6 10 20 4 8
Adding a column of consecutive numbers:
Example
> df2$consecutive_numbers<-101:120 > df2
Output
y1 y2 consecutive numbers 1 4 7 101 2 11 7 102 3 5 5 103 4 3 8 104 5 6 5 105 6 4 8 106 7 6 6 107 8 2 10 108 9 1 8 109 10 6 6 110 11 6 5 111 12 2 10 112 13 4 3 113 14 1 12 114 15 5 9 115 16 4 8 116 17 5 8 117 18 4 2 118 19 6 10 119 20 4 8 120
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