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Removing Ï.., I and two dots or umlaut, when using read.csv in R

Here’s something I used to bump in a lot when working with external files that I receive from clients: some gibberish prepended to the first column name of a data frame when using read.csv. However, there’s a good reason why this happens. The first character is a magical character, invisible… 

randomForest gives NA/NaN/Inf in foreign function call and how to solve it

Personally, Random Forest is one of my favorite algorithms for supervised learning. It’s quick and dirty and still allows for some interpretation. However, R and the RandomForest package are somewhat cryptic when it comes to requirements not met to properly train the algorithm. I bumped a lot into this error…