I have some 3x3 matrices, to be exact there are four of them. I want
to form a 6 x 6 matrix from a two by two block of the four.
Specifically here they are:
>>> FEx
[0, 0, 0]
[0, 0, 0]
[0, 0, 0]
>>> FBx
[0, 0, 0]
[0, 0, -1]
[0, 1, 0]
>>> GEx
[0, 0, 0]
[0, 0, 1]
[0, -1, 0]
>>> GBx
[0, 0, 0]
[0, 0, 0]
[0, 0, 0]
The block matrix I want can be written
(FEx FBx)
(GEx GBx)
If the above formatted ok you should see what I want.
However, the following attempt:
Matrix(((Fex,FBx),(GEx,GBx)))
produces
Matrix((FEx,FBx),(GEx,GBx))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/usr/local/lib/python2.6/dist-packages/sympy-0.7.1-py2.6.egg/sympy/matrices/matrices.py",
line 158, in __init__
raise TypeError("Data type not understood")
TypeError: Data type not understood
When I enter Matrix((FEx,FBx,GEx,GBx)) I get:
[0, 0, 0]
[0, 0, 0]
[0, 0, 0]
[0, 0, 0]
[0, 0, -1]
[0, 1, 0]
[0, 0, 0]
[0, 0, 1]
[0, -1, 0]
[0, 0, 0]
[0, 0, 0]
[0, 0, 0]
which is a 12 x 3 matrix.
So my question is how to create a 6 x 6 matrix in the form indicated above?
Thanks for suggestions.
Comer
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