Where's the endless loop?

[Mark17]

Your code was taking a long time when you added bars to the chart one at a time. Now you plot all the bars at once, just like I am doing. Looping to group the data will be slower than using the dataset functions, but the difference is so minor when compared to drawing a plot that it is lost in the noise.

Ohhhh okay... I misunderstood the source of the delay.

In my initial attempt, I did not realize I was adding bars one at a time. In the end, why was the output four blank subplots rather than four subplots with a single bar?

Mark