home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
IRIX 6.2 Development Libraries
/
SGI IRIX 6.2 Development Libraries.iso
/
dist
/
complib.idb
/
usr
/
share
/
catman
/
p_man
/
cat3
/
complib
/
TRED1.z
/
TRED1
Wrap
Text File
|
1996-03-14
|
3KB
|
67 lines
____TTTTRRRREEEEDDDD1111((((3333FFFF)))) ____TTTTRRRREEEEDDDD1111((((3333FFFF))))
NNNNAAAAMMMMEEEE
TRED1, STRED1 - EISPACK routine. This subroutine reduces a REAL
SYMMETRIC matrix to a symmetric tridiagonal matrix using orthogonal
similarity transformations.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ttttrrrreeeedddd1111((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnmmmm,,,,nnnn)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssrrrreeeedddd1111((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
rrrreeeeaaaallll aaaa((((nnnnmmmm,,,,nnnn)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Input
NNNNMMMM must be set to the row dimension of two-dimensional array parameters
as declared in the calling program dimension statement.
NNNN is the order of the matrix.
AAAA contains the real symmetric input matrix. Only the lower triangle of
the matrix need be supplied. On Output
AAAA contains information about the orthogonal trans- formations used in the
reduction in its strict lower triangle. The full upper triangle of A is
unaltered.
DDDD contains the diagonal elements of the tridiagonal matrix.
EEEE contains the subdiagonal elements of the tridiagonal matrix in its last
N-1 positions. E(1) is set to zero.
EEEE2222 contains the squares of the corresponding elements of E. E2 may
coincide with E if the squares are not needed. Questions and comments
should be directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
NATIONAL LABORATORY
PPPPaaaaggggeeee 1111