symbolic matrix computations

[Gideon Simpson]

I'm trying to do the following:

1.  Construct a (small) matrix with a symbolic entry

2.  Compute it's eigenvalues/eigenvectors in terms of the symbolic value

3.  Evaluate the computed eigenvalues/eigenvectors at a particular numerical value

I have no trouble doing task 1 and 2, suing the Matrix structure, but I am totally stuck on task 3.

[Michele Zaffalon]

You could call nullspace on the matrix A-lambda.

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[Michele Zaffalon]

Sorry, I have misread.

Does subs(ex, [(x, x_val), (y, y_val)]) not work? x is the symbol and x_val is its numerical value.