dear all,
I have two dataframes
dataframe1
ID
a
b
c
dataframe2
ID value
a;W 100
X;c 200
Y;Z 300
I wanted to match the IDs from the two dataframes and record the values into
a new column of dataframe1 at the corresponding rows. This is what I expect:
dataframe1
ID value
a 100
b
c 200
I tried doing it like this:
for (i in seq(1:nrow(dataframe1))) {
dataframe1[i,"value"]<-dataframe2[grep(dataframe1[i,"ID"],
dataframe2$ID),"value"]
}
but I failed. I was able to extracted the values from dataframe2 but not
able to record the values in the corresponding rows of dataframe1.
I would appreciate any suggestions. Thanks in advance.
Jim
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