logical statements of an array

Given A = [2, 4, 6, 8, 10];

I don't understand what this command is actually doing A(logical([0, 0, 1, 1, 1]))

This is what it produces

ans =

     6     8    10

Answer 1

[John D'Errico]

It is equivalent to:

A(find([0 0 1 1 1]))

[Rick]

could you explain in words what the command is doing? I'm a little bit stuck on that part.

Answer 2

[Star Strider]

The command essentially works like the ‘if’ block inside the ‘for’ loop as it considers each element of logical array ‘L’ in turn:

A = [2, 4, 6, 8, 10];
L = [0 0 1 1 1];            % ‘0’ = ‘false’, ‘1’ = ‘true’
B = [];                     % Array ‘B’ is initially empty
for k1 = 1:length(A)
    if L(k1) == 1           % If an element of ‘L’ is ‘true’
        B = [B A(k1)];      % Add that element to array ‘B’
    end
end

Answer 3

[per isakson]

See

• Using Logicals in Array Indexing