Specifies the Jacobi sweep tolerance in scientific notation. The default value is 1.0E-12.
Eigen analyses use an NxN subspace to calculate the natural frequencies and mode shapes for a reduced problem. The first step is to perform a Jacobi denationalization of the subspace. Iterations are performed until the off-diagonal terms of the matrix are approximately zero. The software considers off-diagonal terms to be close enough to zero when their ratio to the on-diagonal term in the row is smaller the Jacobi sweep tolerance.
Do not change the default value unless you understand the IEEE-488 double precision word (of approximately 14 significant figures) on the IBM PC and the approximate size of the on-diagonal coefficients in the stiffness matrix for the problem to be solved (which may be estimated from simple beam expressions).