column compression, kernel, nullspace
[W,rk]=colcomp(A [,flag] [,tol])
real or complex matrix
character string
real number
square non-singular matrix (change of basis)
integer (rank of A
)
Column compression of A
: Ac = A*W
is
column compressed i.e
Ac=[0,Af]
with Af
full column rank,
rank(Af
) = rank(A
) = rk
.
flag
and tol
are optional parameters: flag = 'qr'
or 'svd'
(default is 'svd'
).
tol
= tolerance parameter (of order %eps
as default value).
The ma-rk
first columns of W
span the kernel of A
when size(A)=(na,ma)