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How do I take the mean of each row every third column?

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Hi all,
This is what I'm trying to do- E is a 65x900 array, and I want to extract from that the mean for each row of every third column-in other words, for rows 1 to 65, I want the mean across each row but only of values in columns 1, 4, 7,10, etc, so that I get a 65x1 vector-how would I do that?
Best regards

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