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How do I find the mean for 42 rows for one column, but for the second column only the first 3 rows, which is pulled from an excel table.

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Collin Kerr 2016-3-8

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回答： Chad Greene 2016-3-8

采纳的回答： Chad Greene

I just need to figure out how to extract only part of a column

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Chad Greene 2016-3-8

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If your dataset looks like this:

X = rand(100,3);

You can get the mean of the first 42 rows of the first column of X by

mean(X(1:42,1))

and the mean of the first three rows of column 2 by:

mean(X(1:3,2))

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