Reshape the Columns of Data Frame in R

Question

I have a data frame (for example)

 Week Bags
 4     5
 6     3
10     5
13     7
18     5
23     1
30     9
31     9
32     4
33     7
35     1
38     2
42     2
47     2

'Week' column denotes the week number in an year and 'Bags' denotes the number of bags used by a small firm. I want my data frame in the form of Week Bags 1 0 2 0 3 0 4 5 5 0 6 3 7 0 8 0 9 0 10 5 and so on, in order to plot the weekly changes in number of bags. I am sure it is very silly question but I could not find any way. Please help in this direction.

Answer 1

You can create another dataset

df2 <- data.frame(Week= 1:max(df1$Week))

and then merge with the first dataset

res<- merge(df1, df2, all=TRUE)
res$Bags[is.na(res$Bags)] <- 0
head(res,10)
#  Week Bags
#1     1    0
#2     2    0
#3     3    0
#4     4    5
#5     5    0
#6     6    3
#7     7    0
#8     8    0
#9     9    0
#10   10    5

Or using data.table

library(data.table)
res1 <- setDT(df1, key='Week')[J(Week = 1:max(Week))][is.na(Bags), Bags:=0][]