title: How to return a dataframe value from row and column reference?
body: <p>I know this is probably a basic question, but somehow I can't find the answer. I was wondering how it's possible to return a value from a dataframe if I know the row and column to look for? E.g. If I have a dataframe with columns <code>1-4</code> and rows <code>A-D</code>, how would I return the value for <code>B4</code>?</p>