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I want to transform the contents of a factor column in a dataframe from lowercase to upper case. The function toupper(dataframe$columnname) prints the contents in uppercase, but nothing actually seems to happen to the contents. When I check using levels(dataframe$columnname) or just visually inspecting the dataframe, the contents are still in lowercase. What I am doing wrong?

KaC
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  • you are not updating your vector by replacing them with `toupper` output. Maybe, `dataframe$columnname <- toupper(dataframe$columnname)` will work – Jilber Urbina Apr 13 '18 at 16:33

1 Answers1

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To change your data.taframe's content you must alter the columns values

dataframe$columnname <- toupper(dataframe$columnname)

Although, if you want to play with characters, do it like

dataframe$columnname <- toupper(as.character(dataframe$columnname))
Roberto Moratore
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Felipe Alvarenga
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