Hi, folks,

Suppose the data is as follows:

#######

x=1:10
y=2:11
z=3:12

data1=data.frame(x,y)
data2=data.frame(x,z)

######

In real case, how to check data1$x and data2$x are the same or not?  I am
using for-loop to do this.

Is there a quicker way?

Thanks!

Yi

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