Fltering to subsets of matrices

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David 2012-5-4

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关闭： MATLAB Answer Bot 2021-8-20

both Excel and Sql can 'query' and run functions on subsets of data based on common lable fields (e.g. return all sales in GA)

sum if 'GA' or count if 'GA'

Does Matlab have similare functionality?

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Sean de Wolski 2012-5-4

Please provide a small example (inputs/ops/expected outputs).

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回答（1 个）

per isakson 2012-5-4

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Yes!

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?

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David 2012-5-22

Sorry, but I was not successful using the previous answer and I assumed it was because of the way I framed my question - which is why I tried to improve my question.

per isakson 2012-5-22

Does your code work now?

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