p = etree(A)
p = etree(A,'col')
[p,q] = etree(...)
p = etree(A)
returns an elimination tree for the square symmetric matrix whose upper triangle is that of A
. p(j)
is the parent of column j
in the tree, or 0 if j
is a root.
p = etree(A,'col')
returns the elimination tree of A'
*A
.
[p,q] = etree(...)
returns a postorder permutation q
on the tree.
etreeplot(sprandsym(50, 0.1))
(c) Copyright 1994 by The MathWorks, Inc.