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24 lines
693 B
24 lines
693 B
/*
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* Copyright(C) 1999-2020, 2023 National Technology & Engineering Solutions
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* of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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* NTESS, the U.S. Government retains certain rights in this software.
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*
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* See packages/seacas/LICENSE for details
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*/
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#include "defs.h"
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#include "structs.h"
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/* Check an eigenpair of A by direct multiplication. */
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double checkeig(double *err, struct vtx_data **A, double *y, int n, double lambda, double *vwsqrt,
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double *work)
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{
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double resid;
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double normy;
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splarax(err, A, n, y, vwsqrt, work);
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scadd(err, 1, n, -lambda, y);
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normy = ch_norm(y, 1, n);
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resid = ch_norm(err, 1, n) / normy;
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return (resid);
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}
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