doi:10.1093/comjnl/bxt130

Comp J 2014;57(3): 469–479

Descriptions of LLH3 and LLH9 are amended as follows:

LLH3: Select largest sum(or close to largest) of row, column or diagonal and smallest sum (or close to smallest) of row, column or diagonal and swap the largest element from the first with smallest in the second.

LLH9: Select the row with the largest sum(or close to largest) and another rowwith the lowest sum(or close to smallest) and swap each entry with a probability of 0.5. Then, do the same for columns.

The authors apologise for this error.

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