％ COMPDIR Computes a search direction in a subspace defined by Z. ％ Helper function for NLCONST.％ Returns Newton direction if possible.％ Returns random direction if gradient is small.％ Otherwise, returns steepest descent direction. ％ If the steepest descent direction is small it computes a negative％ curvature direction based on the most negative eigenvalue.％ For singular matrices, returns steepest descent even if small.
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