The behavior of match function

x<-1:10
y<-x+1e-20
x

[1]  1  2  3  4  5  6  7  8  9 10

y

[1]  1  2  3  4  5  6  7  8  9 10

identical(x,y)

[1] FALSE

match(x,y)

[1]  1  2  3  4  5  6  7  8  9 10

What's the  principle the function use to determine if x match y?

Thank you!
 				


2005-10-21

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Deparment of Sociology
Fudan University

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