CODEWITHSUNDEEP
rdataframe
Digvijay Sawant
Digvijay Sawant

Reputation: 1079

Copy rows of dataframes in R

I have a dataframe:

df <- data.frame(id = c('1','2','3'), b = c('b1', '', 'b3'), c = c('c1', 'c2', ''), d = c('d1', '', ''))

id b   c   d
1  b1  c1  d1
2      c2 
3  b3

where the row with id-1 is filled with all data with no empty column values. I want to copy all cell values from id-1 into id 2 and 3 if there are missing values in those cells from rows 2 & 3. Final output something like:

df2 <- data.frame(id = c('1','2','3'), b = c('b1', 'b1', 'b3'), c = c('c1', 'c2', 'c1'), d = c('d1', 'd1', 'd1'))

id b   c   d
1  b1  c1  d1
2  b1  c2  d1
3  b3  c1  d1

Thank you for your help in advance

Upvotes: 1

Views: 303

Answers (1)

thelatemail
thelatemail

Reputation: 93938

Use some matrix indexing to get the "" cases and then overwrite selecting the appropriate column from the first row of df:

idx <- which(df[-1]=="", arr.ind=TRUE)
df[-1][idx] <- unlist(df[1,-1][idx[,"col"]])

#  id  b  c  d
#1  1 b1 c1 d1
#2  2 b1 c2 d1
#3  3 b3 c1 d1

Upvotes: 1

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