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@dialektike
Created January 22, 2016 07:13
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> test <- c("Test tesT") ##입력
> test ## 확인
[1] "Test tesT"
> tolower(test) ## 소문자로 바꿉니다.
[1] "test test"
> toupper(test) ## 대문자로 바꿉니다.
[1] "TEST TEST"
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