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

Chapter 15 Sparse Eigenvalues and Eigenvectors 1071

Matrix value input to main diagonal DSEVVD

Name DSEVVD

Matrix value input to main diagonal

Purpose This subprogram adds to the values of corresponding entries on the main

diagonal of one of the sparse matrices.

Usage VECLIB:

CHARACTER*1 matrix

INTEGER*4 norder, ier

REAL*8 values(norder), global(150)

CALL DSEVVD(matrix, values, global, ier)

VECLIB8:

CHARACTER*1 matrix

INTEGER*8 norder, ier

REAL*8 values(norder), global(150)

CALL DSEVVD(matrix, values, global, ier)

Input matrix Character string denoting the matrix for which the

nonzero location is being input:

’A’ or ’a’ or

’K’ or ’k’ Add to the matrix on the left side.

’B’ or ’b’ or

’M’ or ’m’ Add to the matrix on the right side.

values Array of values to be added to the corresponding

entries on main diagonal of the matrix speciﬁed by

matrix.

Updated global Global communications array for this problem. This

array must be passed, untouched by the user, to

successive subroutines in this package.

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 = −403 Illegal value for matrix designator.