[R] Creating binary variable depending on strings of two dataframes

[Pete Pete]

Hi,
consider the following two dataframes:
x1=c("232","3454","3455","342","13")
x2=c("1","1","1","0","0")
data1=data.frame(x1,x2)

y1=c("232","232","3454","3454","3455","342","13","13","13","13")
y2=c("E1","F3","F5","E1","E2","H4","F8","G3","E1","H2")
data2=data.frame(y1,y2)

I need a new column in dataframe data1 (x3), which is either 0 or 1
depending if the value "E1" in y2 of data2 is true while x1=y1. The result
of data1 should look like this:
   x1     x2 x3
1 232   1   1
2 3454 1   1
3 3455 1   0
4 342   0   0
5 13     0   1

I think a SQL command could help me but I am too inexperienced with it to
get there.

Thanks for your help!

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