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Ó÷ÇÏßÐÔPCGÇó½âÆ÷Ìáʾ¡°During this loadstep the PCG iterative solver took more than 1000  iterations to solve the system of equations. In the future it may be
more efficient to choose a direct solver, such as the SPARSE solver, for this analysis.¡± £» ¶ø²ÉÓÃÇ°ÃæÌáʾµÄSPARSE solverÔò³öÏÖ¡°Preconditioned conjugate gradient solver error level 1. Possibly, the  model is unconstrained or additional iterations may be needed. Try  running setting the multiplier MULT on the EQSLV command to greater
than 1.0 (but less than 3.0). ¡±
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