import pandas as pd

pd.__version__

dr = pd.date_range('now',periods=10)

df = pd.DataFrame(randn(10,2),index=dr)

df

df[1][:5]=nan

df

df[0].plot()

display(gcf())

df[1].plot()

display(gcf())

df['selector'] = df[1].notnull()

df

df[0].plot()

display(gcf())

df[df.selector][0].plot(style='r*')

display(gcf())