blur is a generic function used to add noise to a signal as defined
by various objects. The method invokes particular
which depend on the
class of the first argument.
an object from which adding noise to its signal is desired
matrix containing signal to be affected
additional arguments affecting the noise addition
The form of the value returned by
blur depends on the
class of its argument. See the documentation of the particular methods
for details of what is produced by that method.