HP MLIB User's Guide Vol. 2 7th Ed.

1078 HP MLIB User’s Guide

DSEVVM Matrix value input by matrix

Output ier Status response:

ier = 0 Normal return.

ier = −400 Incorrect processing path; DSEVOR

not called or eigenextraction already

begun.

ier = −401 Error in dynamic storage allocation.

ier = −402 Illegal value for either nnode or in

nodlst.

ier = −403 Illegal value for matrix designator.

ier = −404 At least one subscript pair was not

speciﬁed in structure input. No room

for value.

ier = −405 The B matrix was speciﬁed as

diagonal. Cannot add off-diagonal

nonzero value.

ier = −406 The B matrix was speciﬁed as an

identity matrix. Cannot add nonzero

value.

Notes This is the most efﬁcient mechanism for specifying nonzero values. Normally,

DSEVVM is used in conjunction with DSEVIM. The matrix structure passed to

DSEVVM must be identical to the structure passed to DSEVIM.

Actual character arguments in a subroutine call may be longer than

corresponding dummy arguments. Therefore, readability of the CALL

statement may be improved by coding the matrix argument as ’addleft’.

Example In a small (order 6) sparse generalized eigenvalue problem, B is the following

mass matrix:

Use DSEVVM and DSEVVD to input this as B.

4.0 0.0 1.0 1.0 0.0 0.0

0.0 4.0 1.0 0.0 1.0 0.0

1.0 1.0 4.0 0.0 1.0 0.0

1.0 0.0 0.0 4.0 1.0 0.0

0.0 1.0 1.0 1.0 4.0 0.0

0.0 0.0 0.0 0.0 0.0 0.0