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…
One of the compulsive things I do in my programming life is trying to keep all column names in uppercase. Inbetween my code you can often find a line of code that manually adjusts the column names of a data frame. However, I read the following in a colleague’s code…
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…
In R, it often happens that I need to calculate the share of each column by row. In this very simple example I would like to update the following table: apples oranges bananas pineapples 2 4 6 3 1 0 9 2 5 1 2 3 and I would like…
If you are running into this error in R, chances are that you are running a recursive function that runs too deep. I found this page to be particularly good in explaining the concept. But here’s an example: In this example, we run the pop_pringles function and we will keep…