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6.50.5  Matrix column norm: colnorm colNorm l1norm

The column norm of a matrix A is maxj(∑k |aj,k|). (This is also an operator norm; see Section 6.50.6.) The colnorm command finds the column norm of a matrix.
colNorm is a synonym for colnorm, and for matrices l1norm is also a synonym.


Example:
Input:

colnorm([[1,2],[3,-4]])

Output:

6

Indeed: max(1+3,2+4)=6


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