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STAAD Commands and Input Instructions
Section 5
5-172
meets the convergence tolerance, then the Subspace iteration is
done. If the cut off frequency f1 results in fewer modes than i1,
then only those frequencies up to the cut off are used. If the cut off
frequency would result in more modes than i1, then only the first
i1 modes are used. That is, the modes cut off takes precedence
over the frequency cut off.