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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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