r - Loop a if statment through rows -


i new r asking basic question.

i have 2 data frames

data frame 1 contains matching pairs: 

factor1 factor2         d   b       e   c       f

data frame 2 contains level of different factors in different samples:

  sample1 sample2   10      0 b   10      0 c   0       0 d   0       10 e   0       10 f   0       0

i trying loop through first data frame. each row in data frame 1, if level of factor1 larger 5 in sample 1 , level of factor 2 larger 5 in sample 2, add true in third column data frame 1. otherwise add false. hope question clear enough. thanks

factor1 factor2 if_match         d       true   b       e       true   c       f       false

assuming number of columns same in 2 datasets, use match index of rows based on comparing rownames of 'df2' of each column of 'df1', corresponding column value of second dataset, check if greater or equal 5 , reduce single logical vector

df2$if_match <- reduce(`|`, map(function(x, y) y[match(row.names(df2),                      x, nomatch = 0)] >=5 , df1, df2)) df2$if_match #[1]  true  true false

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