.. function:: nodeEigenvector(nodeTag, eigenvector, dof=-1)
Returns the eigenvector at a specified node.
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``nodeTag`` |int| node tag.
``eigenvector`` |int| mode number of eigenvector to be returned
``dof`` |int| specific dof at the node (1 through ndf), (optional), if no ``dof`` is
provided, a list of values for all dofs is returned.
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