Feature request

Currently thehexbin function allows for its first two parametersx andy to be strings ofdata (usually a pandas DataFrame), but notC

importnumpyasnpimportpandasaspdimportmatplotlib.pyplotaspltdf=pd.DataFrame(np.random.rand(100000,3))df.columns= ['a','b','c']plt.hexbin('a','b',C='c',data=df)

Results inIndexError: string index out of range

Currently, you must pass inC as a Series/array
plt.hexbin('a', 'b', C=df['c'], data=df)