[R] problem with recording numeric output into another dataframe

[Rnewbie]

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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