Question

How to replace only set of values in a vector to different values in a dataframe?

I want to replace the values of few countries with its abbrevated form.

Can someone tell how to do this?

Answer 1

If you have a condition using which specific values need to be changed then add the condition using which() to fetch the required values from the vector and then change.

For example,

dataframe$vector[which(condition) ] = "New Value"

Suppose you need to fetch the first 2 characters of the names from a vector which are from africa continentconti Then you can use r code as

countries$names[which(continent == "Africa")] = substr(countries$names,1,3)