Hi, I have a set of data that I want to create a contour plot for.
Since I have the data and not the function that created the data, I
cannot use contour_plot. Matplotlib has a function "contour" that
accepts a vector of data and does exactly what I want expect I cannot
get it to work in Sage notebook.

I tried using the example given on the Matplotlib webpage which
amounts to:
import matplotlib.pyplot as plt
plt.contour(Z)
plt.show()

(where Z is my data). However nothing shows up. Any suggestions?

thanks, Greg
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