Operation of specific elements of a matrix

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Alexis Villacis
Alexis Villacis 2018-12-18
回答： madhan ravi 2018-12-18
I have a matrix of dimensions 3000x3.
I need to compute statistics for the elements (1,1),(4,1),(7,1), (10,1),...,(3000,1)
how can I code this statistic i.e mean? It is basically the mean of the elements of the first colum, which are in rows 1,4,7,10...3000 i.e i+3?

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madhan ravi
madhan ravi 2018-12-18
mean(matrix(1:3:end,1))

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