On Fri, Jan 30, 2009 at 3:32 PM, bizoid <[email protected]> wrote:
>
> 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.
Do
P = Graphics()
William
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