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5.54.4  Matrix row norm: rownorm rowNorm

rownorm (or rowNorm) takes as argument a matrix A=aj,k.
rownorm (or rowNorm) returns maxk(∑j |aj,k|).
Input:

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

or:

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

Output:

7

Indeed: max(1+2,3+4)=7


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