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Fltering to subsets of matrices
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per isakson on 4 May 2012
sum( MyData( strcmp( MyData( :, ixColumn ), 'GA' ), : ), 1 )
This question is very close to Summing values with database "group by" functionality. It is a better tactic to provide a toy example than repeating the question! Didn't the answers to you other question help you?