Matplotlib scatter plot slider with datetime

[sonny]

I have a matplotlib scatter plot with dates on the x axis, that updates with a slider, very similar to the example linked here. Per this example, I had been using np.vstack(), but with my dates converted into floats. That worked fine.

xx = np.vstack((df['date'], df['cups']))
scat.set_offsets(xx.T)

However, I am now passing datetime objects to the scatter plot, so that my x axis shows dates instead of floats, and this seems to break np.vstack(), since it requires the numpy array to have mixed datatypes.

As I understand it, the purpose of using vstack is to get the data in the right shape for set_offsets. Since the end-goal is to call set_offsets with the right kind of structure, the solution need not use vstack. However, I'm just not sure how to get the structure that set_offsets requires without using vstack.