Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1268 by ast...@caltech.edu: allow lambdify to take vectors and
matrices are arguments
http://code.google.com/p/sympy/issues/detail?id=1268
It would be nice to have the following code work. With the attached patch,
it does. (Sorry I can't post to sympy-patches for some reason -- I have now
subscribed and my post is still not getting through.)
X=sympy.DeferredVector('X')
M=Matrix([[X[0]**2, X[0]*X[1], X[0]*X[2]],
[X[1]*X[0], X[1]**2, X[1]*X[2]],
[X[2]*X[0], X[2]*X[1], X[2]**2]])
f = lambdify(X, M, "numpy")
Xh = array([1.0, 2.0, 3.0])
expected = matrix([[Xh[0]**2, Xh[0]*Xh[1], Xh[0]*Xh[2]],
[Xh[1]*Xh[0], Xh[1]**2, Xh[1]*Xh[2]],
[Xh[2]*Xh[0], Xh[2]*Xh[1], Xh[2]**2]])
actual = f(Xh)
assert numpy.allclose(actual,expected)
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