Comment #10 on issue 604 by idichekop: write tests for p = x**3+2*x**2+8; r
= roots(p, x);
http://code.google.com/p/sympy/issues/detail?id=604
Hello all,
I wanted to shoot this issue here, but when just trying it out I became the
following
output:
=======
In [67]: p = x**3+2*x**2+8
In [68]: r = roots(p,x)
In [69]: a = r[0].evalf()
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
C:\Python26\Lib\site-packages\<ipython console> in <module>()
KeyError: 0
In [70]: r
Out[70]:
{-2/3 - 4/(9*(116/27 + 4*93**(1/2)/9)**(1/3)) - (116/27 +
4*93**(1/2)/9)**(1/3):
1,
-2/3 + 4/(9*(1/2 + I*3**(1/2)/2)*(116/27 + 4*93**(1/2)/9)**(1/3)) +
(116/27 + 4
*93**(1/2)/9)**(1/3)/2 + I*3**(1/2)*(116/27 + 4*93**(1/2)/9)**(1/3)/2: 1,
-2/3 + 4/(9*(1/2 - I*3**(1/2)/2)*(116/27 + 4*93**(1/2)/9)**(1/3)) +
(116/27 + 4
*93**(1/2)/9)**(1/3)/2 - I*3**(1/2)*(116/27 + 4*93**(1/2)/9)**(1/3)/2: 1}
In [71]:
==========
Apparently, I cannot use "r[0]" here. What am I doing wrong.
As I said, when this is clear, this test is mine to write :D!
Best,
Julio
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