There's no other way to say this without sounding rude, but you weren't unable to learn R because you couldn't understand what a dataframe was - you were unable to learn R because you gave up. Blaming a data structure for the failure seems like a bit of a stretch.
That is what I said. I didn't understand what a dataframe was. Note that I didn't really blame the data structure. I said it was an irritating factor. Someone else might not have been as irritated. But if R was closer to what I already knew, learning would have been easier. For me.
