[Solved] How to replace a value by another within a variable in R?

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You can use this approach to get what you need:

df = within(df, {
   variable[variable == "string"] = "string2"
   variable[is.na(variable)] = mean(variable)
 })

The trick here is that you can create a subset using [] and assign values again to that subset using [] =.

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solved How to replace a value by another within a variable in R?