Dear All,
I am trying to merge 2 dataframes of with different sizes.
Let's say that one dataframe R contains some raw data and another data
frame F contains the information to fix R.
For instance
F <- data.frame(cbind(x=-seq(10),
y=1:10,
z=3:12,
w=8:17,
p=18
))
R <- data.frame(cbind(x=rep(-seq(3),5), y=18:32,z=100:86,w=4,k=9))
I would like to do the following: for every value of R$x (i.e. 1,2,3 in
this case), I will look up the same value in
F$x and use the info on that row of F to update the values of R$y, R$z,R$w
(i.e. the raws which have the same names in both data frames), whereas I
will simply append (as a new column) the values of F$p to the new
dataframe.
The resulting data frame should look like this
x y z w k p
-1 1 3 8 9 18
-2 2 4 9 9 18
-3 3 5 10 9 18
-1 1 3 8 9 18
-2 2 4 9 9 18
-3 3 5 10 9 18
-1 1 3 8 9 18
-2 2 4 9 9 18
-3 3 5 10 9 18
-1 1 3 8 9 18
-2 2 4 9 9 18
-3 3 5 10 9 18
-1 1 3 8 9 18
-2 2 4 9 9 18
-3 3 5 10 9 18
(it took longer to explain it than to do it!).
I can do this with a double loop, but I think that playing with the merge
command should do the trick, although so far I have been unsuccessful.
Any suggestion is welcome.
Lorenzo
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