How to select specific entries of a matrix?

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Ammy
Ammy il 31 Ago 2021
Commentato: Ammy il 31 Ago 2021
How to select elements of matrix at the following rows and columns
1,4,7,10,13,16,...
In other words, select elements of matrix at first row and first column, fourth row and fourth column, seventh row and seventh column and so on...

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Matt J
Matt J il 31 Ago 2021
A(1:3:end,1:3:end)

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