null (function)
Construct the nullspace of a matrix.
nullsp=null(a)
Inputs
a Any matrix.
Outputs
nullsp null(undefined) if the matrix is of full rank, or a matrix containing the basis for the null-space of a .


Description
The result satisfies a*nullsp= 0 . Further, any vector x for which a*x=0 can be written as a linear combination of the columns of nullsp.

Note that this description applies only to the use of null as a function. Otherwise, null is the value of any variable which is undefined.
Example
>>a=[2 3 4;5 6 7]
>>a
          2          3          4
          5          6          7

>>c=null(a)
>>c
    0.4082
   -0.8165
    0.4082

>>a*c
Scaled by 10^-15
   -0.4441
         0