Matching row names was the request.
# continuing with your example:
rownames(d1)<- letters[1:5]
rownames(d2)<- letters[3:7]
# and then for rownames of d1 that are also in rownames of d2:
# for the full rows ...
d1[row.names(d1) %in% row.names(d2),]
# or for just the names:
rownames(d1)[row
Hi
#Create data and data frames
x=rnorm(5,0,1)
y=rnorm(5,0,1)
z=rnorm(5,0,1)
d1=data.frame(x,y)
d2=data.frame(y,z)
#which variable name in d2 is a variable name in d1?
names(d2[names(d2)%in%names(d1)]) # it's y
#give me the columns of d2 that have variable names
#that are also variable names in
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