On Mon, 17 Oct 2011 at 03:37PM -0700, Eric Kangas wrote:
> Sage: contour_plot(lambda y,t: (sqrt(t^2+y^2)/(2*pi*y))*(bessel_J(0,
> t ).arccos()), (t, 0, 3), (y, 0, 4), fill = false, axes_labels=['$gro
> $','$kro$'], contours = [0.1, 0.2, 0.3, 0.5, 0.7, 1.0, 2.0, 4.0],
> fill=False, legend_label='qwall');
> 
> This is the error message that I get when processing the code:
> 
> The error I get is: File "<ipython console>", line 1 SyntaxError:
> keyword argument repeated (<ipython console>, line 1).

You are using the keyword argument "fill" twice: you have both
"fill=false" and "fill=False". The usual Python boolean False is spelled
with a capital F, so I'm guessing Sage/Python is confused since you are
giving it two different values for "fill". 

Dan

--
---  Dan Drake
-----  http://mathsci.kaist.ac.kr/~drake
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