36 lines
916 B
Markdown
36 lines
916 B
Markdown
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# EigenTridiagonalQL
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Compute all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm (LAPACK function [STERF](https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-fortran/2025-2/sterf.html)).
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Computing for type matrix<double>
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```
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bool matrix::EigenTridiagonalQL(
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vector& eigen_values // vector of computed eigenvalues
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);
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```
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Computing for type matrix<float>
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```
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bool matrixf::EigenTridiagonalQL(
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vectorf& eigen_values // vector of computed eigenvalues
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);
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```
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Parameters
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eigen_values
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[out] Vector of eigenvalues.
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Return Value
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Return true if successful, otherwise false in case of an [error](/en/docs/constants/errorswarnings/errorcodes).
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Note
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The input must be a symmetric matrix in the tridiagonal form.
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