norm:

Synopsis: Compute the norm of a matrix or vector.

Syntax:	norm ( A )
	norm ( A , "type" )
	norm ( A, P )

Description:

	The first form defaults to computing the 1-norm of the input
	matrix. The second and third forms allow the user to specify
	the desired vector or matrix norm.

	type:

	"M" or "m" returns max(abs( MATRIX ))
	
	"1", "O" or "o" return the 1-norm (default)

	"2" returns the matrix 2-norm (largest singular value)

	"I" or "i" returns the infinity-norm

	"F", "f", "E" or "e" returns the Frobenius norm.

	LAPACK subroutines DLANGE and ZLANGE are used to compute all
	norms, except the 2-norm.

	If the third form of the function is used, then norm attempts
	to compute the vector p-norm. If A is not a row or column
	vector, then an error occurs.

	Obscure feature: If P is Inf (the output from inf(), for
	example), then norm will compute the Infinity norm of the
	vector _or_ matrix A.
