Selecting specific rows and then summing them up

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Hi, suppose I have a matrix A=[1 2 3 4 5 6 7 8 9 10 11 13......12555], I want to select specific elements and add them up in one value. Selection is done after uniform interval. For example, I let the first value to be selected in 1 in the first row and then the next value I would select should be in the tenth row which is the value 10, the next value would be in the 20th row and so on. Then sum all these values together and find their mean. Kindly help me figure out how to go about it. Thanks.

Accepted Answer

Chunru on 15 Jul 2022
B = A(10:10:end); % choose 10,20,30,...
ans = 6280
Chunru on 16 Jul 2022
@Stephen23 See the question

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