17
Gaussian Elimination
0
x
x
x
x
.
.
.
Standard
Way
subtract a multiple of a row
0
x
0
0
. . .
0
LINPACK
apply sequence to a column
x
nb
,
then apply nb to rest of matrix
a
3
=a
3
-a
1
*a
2
a
3
a
2
a
1
L
a
2
=
L
-1
a
2
0
x
0
0
. . .
0
nb
LAPACK
apply sequence to nb
