average vector over selected areas

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Lev Mihailov 2020-2-3

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关闭： MATLAB Answer Bot 2021-8-20

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I have two vectors, one working, the second sections that I need to average in vector 1

A = randi([5 10],1,548); 
B=  [102 105 204 99 ]
% what i need to do x=mean(A(1:B(1)) ; x=mean(A(B(1):B(2))

how do i do this?

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KSSV 2020-2-3

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编辑：KSSV 2020-2-4

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A = randi([5 10],1,548); 
B=  [1 102 105 204]
% what i need to do x=mean(A(1:B(1)) ; x=mean(A(B(1):B(2))
iwant = zeros(length(B)-1,1) ; 
for i = 1:length(B)-1
    if B(i) < B(i+1) ;
        iwant(i) = mean(A(B(i):B(i+1))) ; 
    else
        iwant(i) = mean(A(B(i):-1:B(i+1))) ; 
    end
end

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Image Analyst 2020-2-3

编辑：Image Analyst 2020-2-4

Lev, what indexes in A do you want to average if B(i+1) is LESS than B(i)? Like 200 to 5, or 104 to 6? Do you want to take the mean of from 5 to 200 (the opposite order), inclusive? In other words, sort the numbers in ascending order first?