r - Conditionally replace values with NA as they appear in another data frame -


sorry tried posting first time posting here. relatively new r , have issue 2 data frames need address. based on 2 sets of date/time meteorological data need compare, first need make values na appear in first df.

df1 <- data.frame(wspeed=c(5,3,6,7), wdirection=c(150,160,30,40),                    rain=c(na,na,3,10), rh=c(na,15,90,na)) df2 <- data.frame(wspeed=c(10,5,2,8), wdirection=c(160,150,40,25),                     rain=c(5,10,3,10), rh=c(20,15,90,50))

to give me

df1   wspeed wdirection rain rh 1      5        150   na na 2      3        160   na 15 3      6         30    3 90 4      7         40   10 na  df2    wspeed wdirection rain rh 1     10        160    5 20 2      5        150   10 15 3      2         40    3 90 4      8         25   10 50

i need df2 resemble this:

  wspeed wdirection rain rh 1     10        160   na na 2      5        150   na 15 3      2         40    3 90 4      8         25   10 na

i have date/time column in each row. have searched , can't find answer , hoping if relatively simple answer.

thanking in advance!


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