Sage Support:

I am a new Sage user and I have a question regarding the plot function
in Notebook.

Below is a little snippet of code I wrote to plot the Bessel_J
function for various nu on different intervals.  The snippet below is
just an exercise in learning python and its plot function.

I have one question:

Question #1:

In line 4 of the code below, I assign P = plot(....).  I do this
because the P += plot(....) will not work unless P has been previously
assigned.  How do I assign P an empty plot "object" so line 4 is
unnecessary and line 5 works?

 - - - - - Code - - - - - -

1  def plot_Bessel_J(nu, z):
2      for m in range(0,nu):
3          if m == 0:
4              P = plot(lambda y:bessel_J(m, y), (1, z))           #
Question 1 is in regards to this line
5          P += plot(lambda y:bessel_J(m, y),(1, z))
6      P.show()
7
8  plot_Bessel_J(0,10)

Thank you in advance for any help that you provide.

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