Displaying 2 results from an estimated 2 matches for "dsyevd".
Did you mean:
dsyevr
2004 Nov 05
1
fast partial spectral decompositions.
...o this in
R_ext/Lapack.h is dsyevx. however, i know that in LAPACK dsyevr
can also return a partial eigendecomposition. why is dsyevr not
exported in R_ext/Lapack.h? my superficial understanding is that
dsyevr is "better" (faster? stabler?) for both complete and
partial eigenproblems than dsyevd/dsyevx, but only the complete
eigenproblem interface to dsyevr appears to be exported in
Lapack.h (as dsyev).
corrections to misunderstandings in the above are welcome. advice
on whether using dsyevr rather than dsyevx is (very) important
for partial decompositions is also gratefully accepted.
pl...
2004 Nov 05
1
fast partial spectral decompositions.
...o this in
R_ext/Lapack.h is dsyevx. however, i know that in LAPACK dsyevr
can also return a partial eigendecomposition. why is dsyevr not
exported in R_ext/Lapack.h? my superficial understanding is that
dsyevr is "better" (faster? stabler?) for both complete and
partial eigenproblems than dsyevd/dsyevx, but only the complete
eigenproblem interface to dsyevr appears to be exported in
Lapack.h (as dsyev).
corrections to misunderstandings in the above are welcome. advice
on whether using dsyevr rather than dsyevx is (very) important
for partial decompositions is also gratefully accepted.
pl...