4week : solution7

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> na.data = is.na(data)                                                             ## 결측치를 찾는다.

> impute.data = data                                                                ## data를 impute.data에 할당한다.

> impute.data[na.data] = 0                                                     ## impute.data에서 결측치에 0을 넣는다.

 
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