Error <Figure size 1000×600 with 1 Axes> even with plt.figure () before plt.plot

Question

This is the part of my code with the error (that’s all related to the graph, but the points:

plt.figure (figsize = (10,6))
plt.title ("Alfa x CL")
plt.plot (Alpha,CL, "b",linewidth = 2, label = "Xflr5")
plt.plot (alfa,cl, "r",linewidth = 2, label = "Experimental")
plt.legend (loc = 'upper left')
plt.grid (True)
plt.xlabel ("Alfa")
plt.ylabel ("Cl")
plt.savefig (grafico01) #grafico01 is a variable used before
plt.show ()

And it shows the message < Figure size 1000×600 with 1 Axes > instead of the graph (After runing the program again, the graph is shown for some reason)

After searching a lot, I believe the error is on the order I placed the functions, but I have no ideia with one is the right one, everything I found here was about the plt.figure () being after the plt.plot () (with is not the case here)… Any help with the order? Or is it something else?

Asked By: Marcos Matsuura Ayres

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Source

Answer 1

Put in your variables in the plot function like you already have. Try plotting directly on the desired axes using ax. It is the preferred way of doing things:

import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(10,6))
ax.plot(range(0,10),range(10,0,-1),  'b',linewidth = 2, label = 'Xflr5')
ax.plot(range(0,10),[i*(i**(1/2)) for i in range(0,10)], 'r',linewidth = 2, label = 'Experimental')
ax.set_title('Alfa x CL')
ax.legend(loc='upper left')
ax.grid(True)
ax.set_xlabel ("Alfa")
ax.set_ylabel ("Cl")
plt.savefig ('grafico01.png') #grafico01 is a variable used before
plt.show ()

For another figure just do:

fig2, ax2 = plt.subplots(figsize=(10,6))
ax2.plot(range(0,10),range(10,0,-1),  'b',linewidth = 2, label = 'Xflr5')

just like before.

Answered By: Monty

Error <Figure size 1000×600 with 1 Axes> even with plt.figure () before plt.plot

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