Updates:
Labels: Milestone-Release0.6.4
Comment #1 on issue 1250 by ondrej.certik: incorrect output at sympy.latex()
http://code.google.com/p/sympy/issues/detail?id=1250
Indeed, thanks for the bug report.
Here is what one gets in the lates sympy:
In [1]: A = Symbol('A')
In [2]: B = Symbol('B')
In [3]: M = Matrix(
...: [0,A,B,0]
...: ,[-1,0,0,0]
...: ,[0,0,0,1]
...: ,[0,1,-A,0])
sympy/matrices/matrices.py:137: UserWarning: Deprecated constructor, use
brackets:
Matrix(([0, A, B, 0], [-1, 0, 0, 0], [0, 0, 0, 1], [0, 1, -A, 0]))
warnings.warn("Deprecated constructor, use brackets: Matrix(%s)" %
str(mat))
In [4]: M
Out[4]:
⎡0 A B 0⎤
⎢ ⎥
⎢-1 0 0 0⎥
⎢ ⎥
⎢0 0 0 1⎥
⎢ ⎥
⎣0 1 -A 0⎦
In [5]: M2 = (M + M.transpose())/2
In [6]: M2
Out[6]:
⎡ A B ⎤
⎢ 0 -1/2 + ─ ─ 0 ⎥
⎢ 2 2 ⎥
⎢ ⎥
⎢ A ⎥
⎢-1/2 + ─ 0 0 1/2 ⎥
⎢ 2 ⎥
⎢ ⎥
⎢ B A⎥
⎢ ─ 0 0 1/2 - ─⎥
⎢ 2 2⎥
⎢ ⎥
⎢ A ⎥
⎢ 0 1/2 1/2 - ─ 0 ⎥
⎣ 2 ⎦
In [7]: latex(M2)
Out[7]:
'$\\left(\\begin{smallmatrix}0 & - \\frac{1}{2} + \\frac{1}{2} A &
\\frac{1}{2
} B & 0\\\\- \\frac{1}{2} + \\frac{1}{2} A & 0 & 0 &
\\frac{1}{2}\\\\\\frac{1}
{2} B & 0 & 0 & \\frac{1}{2} - \\frac{1}{2} A\\\\0 & \\frac{1}{2} &
\\frac{1}{
2} - \\frac{1}{2} A & 0\\end{smallmatrix}\\right)$'
So the terms are interchanged, but I guess this bug is still there.
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