Set variable point size in matplotlib
help(plt.plot) shows
markersize or ms: float so it appears plt.plot does not allow the markersize to be an array.
You could use plt.scatter however:
ax1.scatter(data[0], data[1], marker='o', c='b', s=data[2], label='the data')PS. You can also verify that plt.plot's markersize must be a float by searching for "markersize" in the official documentation.