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| int | ritz_value (int itcg, double *valpha, double *vbeta) |
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| int ritz_value |
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int |
itcg, |
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double * |
valpha, |
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double * |
vbeta |
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) |
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- Parameters
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| itcg | The order of the matrix |
| valpha | On entry, the itcg diagonal elements of the tridiagonal matrix. On exit, if info = 0, the eigenvalues in ascending order |
| vbeta | On entry, the (itcg-1) subdiagonal elements of the tridiagonal matrix. On exit, vbeta has been destroyed. |
- Returns
- = 0: successful exit < 0: if -i, the i-th argument had an illegal value > 0: the algorithm failed to find all of the eigenvalues in a total of 30*itcg iterations; if i, then i elements of vbeta have not converged to zero.
- Note
- The user must guarantee valpha and vbeta have at least dimension itcg
