Question: Below is a snippet from the article Experience with a matrix norm estimator by N. Higham. First, we recall the original algorithm of Hager [7],


![Hager [7], on which the estimators in (9) are based. Our notation](https://dsd5zvtm8ll6.cloudfront.net/si.experts.images/questions/2024/09/66f3ae54d13ce_90866f3ae54567cb.jpg)
Below is a snippet from the article Experience with a matrix norm estimator by N. Higham. First, we recall the original algorithm of Hager [7], on which the estimators in (9) are based. Our notation is as follows: e is the vector of all ones, e; is the jth column of the identity matrix, and & sign(y) means i 1 or -1 according as Yi > 0 or Yi 0 or Yi
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