Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3355 by ludo.visser: Inconsistent behavior in Matrix()
http://code.google.com/p/sympy/issues/detail?id=3355
Consider the following:
a = Matrix(2, 1, [q1 - L0*cos(q3), q2 - L0*sin(q3)])
s = Matrix(3, 1, [q1 - d_com*cos(q3), q2 - d_com*sin(q3), q3])
I'm expecting that 'a' is now a vector (column matrix) of length 2, and 's'
a vector of length 3. But:
>>> a
[-L0*cos(q3) + q1, -L0*sin(q3) + q2]
>>> s
[-L0*mf*cos(q3)/(mf + mh) + q1]
[-L0*mf*sin(q3)/(mf + mh) + q2]
[ q3]
It seems that for any length >2 I get a column matrix, and only for vectors
of length 2 the resuls is a row matrix. This is very annoying when
calculating Jacobians...
This issue is somewhat related to issue 884, but I filed it as a new issue,
because I think this is a bug: the same syntax should give the same result.
I'm using SymPy 0.7.1 with Python 2.7.3
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