psym2::eigensym2 Interface Reference

Private Member Functions
subroutine	eigensym2 (em, vv, oo)
	Get the orthogonal eigenvectors, vv, and diagonal matrix of eigenvalues, oo, of the symmetric 2*2 matrix, em. More...
subroutine	eigensym2d (em, vv, oo, vvd, ood, ff)
	For a symmetric 2*2 matrix, em, return the normalized eigenvectors, vv, and the diagonal matrix of eigenvalues, oo. More...

Detailed Description

Definition at line 21 of file psym2.f90.

Constructor & Destructor Documentation

eigensym2()

subroutine psym2::eigensym2::eigensym2 ( real(dp), dimension(2,2), intent(in)  em, real(dp), dimension(2,2), intent(out)  vv, real(dp), dimension(2,2), intent(out)  oo  )

private

Get the orthogonal eigenvectors, vv, and diagonal matrix of eigenvalues, oo, of the symmetric 2*2 matrix, em.

Parameters

[in]	em	symmetric 2*2 matrix
[out]	vv	orthogonal eigenvectors
[out]	oo	diagonal matrix of eigenvalues

Author

R. J. Purser

Definition at line 43 of file psym2.f90.

Member Function/Subroutine Documentation

eigensym2d()

subroutine psym2::eigensym2::eigensym2d ( real(dp), dimension(2,2), intent(in)  em, real(dp), dimension(2,2), intent(out)  vv, real(dp), dimension(2,2), intent(out)  oo, real(dp), dimension(2,2,2,2), intent(out)  vvd, real(dp), dimension(2,2,2,2), intent(out)  ood, logical, intent(out)  ff  )

private

For a symmetric 2*2 matrix, em, return the normalized eigenvectors, vv, and the diagonal matrix of eigenvalues, oo.

If the two eigenvalues are equal, proceed no further and raise the logical failure flag, ff, to .true.; otherwise, return with vvd=d(vv)/d(em) and ood=d(oo)/d(em) and ff=.false., and maintain the symmetries between the last two of the indices of these derivatives.

Parameters

[in]	em	symmetric 2*2 matrix
[out]	vv	normalized eigenvectors
[out]	oo	diagonal matrix of eigenvalues
[out]	vvd	vvd=d(vv)/d(em)
[out]	ood	ood=d(oo)/d(em)
[out]	ff	logical failure flag

Author

R. J. Purser

Definition at line 76 of file psym2.f90.

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The documentation for this interface was generated from the following file:

• /lfs/h2/emc/stmp/george.gayno/UFS_UTILS.tag/sorc/grid_tools.fd/regional_esg_grid.fd/psym2.f90