[R] using function from specific packages

[jiho.han]

hello, useRs-

i have a function that i wrote myself, for example, lag(x). however, when 
i load 'zoo' packages and try to lag 'zoo' object, it gave me error. (R try
to 
pass 'zoo' object into my function.)

i typed 'lag.zoo' in R, but it can't find it. how can i access 'lag.zoo'
function?
and in general, how can i deal with such problem as to access functions from
specific packages
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