Matplotlib: Adding an axes using the same arguments as a previous axes

Question

I want to plot data, in two different subplots. After plotting, I want to go back to the first subplot and plot an additional dataset in it. However, when I do so I get this

Answer 1

Using plt.subplot(1,2,1) creates a new axis in the current figure. The deprecation warning is telling that in a future release, when you call it a second time, it will not grab the previously created axis, instead it will overwrite it.

You can save a reference to the first instance of the axis by assigning it to a variable.

plt.figure()
# keep a reference to the first axis
ax1 = plt.subplot(1,2,1)
ax1.plot(Data)

# and a reference to the second axis
ax2 = plt.subplot(1,2,2)
ax2.plot(Data)

# reuse the first axis
ax1.plot(Data+1)