kernel - kernel, nullspace

Calling Sequence

W=kernel(A [,tol,[,flag])

Parameters

• A : full real or complex matrix or real sparse matrix
• flag : character string 'svd' (default) or 'qr'
• tol : real number
• W : full column rank matrix

Description

W=kernel(A) returns the kernel (nullspace) of A. If A has full column rank then an empty matrix [] is returned.

flag and tol are optional parameters: flag = 'qr' or 'svd' (default is 'svd').

tol = tolerance parameter (of order %eps as default value).

Examples

A=rand(3,1)*rand(1,3);
A*kernel(A)
A=sparse(A);
clean(A*kernel(A))
 

See Also

colcomp  fullrf  fullrfk  linsolve  

Author

F.D.;