Create column in R that increments every row to length of dataframe-CodePudding

I would like to add a column to my dataframe that starts at 0 and increments 0.002 every row till the end of the dataframe.

I tried:

NewCol <- seq(0,len(DF),0.002))
DF <- cbind(DF, NewCol)

My desired output would be: 0.00 0.002 0.004 0.006 ...to the end of the dataframe

The NewCol length was too long to cbind to my dataframe.

CodePudding user response：

We can use nrow for this inside the seq function like so

df <- data.frame(a = c(1:5), b = 6:10)
  a b
1 1 o
2 2 c
3 3 p
4 4 u
5 5 d

df$num = seq(0, by = 0.002, to = nrow(df)*0.002 - 0.002)

# simplified by @Ritchie Sacramento to

df$num = seq(0, by = 0.002, length.out = nrow(df))

  a b   num
1 1 o 0.000
2 2 c 0.002
3 3 p 0.004
4 4 u 0.006
5 5 d 0.008