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2.45.4  Matrix column norm : colnorm colNorm

colnorm (or colNorm) takes as argument a matrix A=aj,k.
colnorm (or colNorm) returns maxj(∑k(|aj,k|)).
Input :

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

or

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

Output :

6

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


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