[R] a question regarding 'cor' function

[Tao Shi]

I'm a little bit confused with how exactly the 'cor' function handles 
missing values.  Should the last two function calls give the same results?   
Thanks,
...Tao

==========================================
>x=rnorm(10)
>y=rnorm(10)
>x[1]=NA
>y[2]=NA
>cor(x,y,method="spearman")
[1] -0.006060606

>cor(x,y,use="pairwise.complete.obs",method="spearman")
[1] -0.006060606
>cor(x[3:10],y[3:10],method="spearman")
[1] 0.1666667
==========================================

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