Comment #2 on issue 3689 by [email protected]: Remove DeferredVector
http://code.google.com/p/sympy/issues/detail?id=3689

The docstring shows an example.

    """A vector whose components are deferred (e.g. for use with lambdify)

    Examples
    ========

    >>> from sympy import DeferredVector, lambdify
    >>> X = DeferredVector( 'X' )
    >>> X
    X
    >>> expr = (X[0] + 2, X[2] + 3)
    >>> func = lambdify( X, expr )
    >>> func( [1, 2, 3] )
    (3, 6)

Whereas IndexedBase can take arbitrary arguments, DeferredVector is only for integers:

x=IndexedBase('x')
x[i]  # that would fail with DeferredVector
x[i]
x[0]
x[0]



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