how to solve this problem?

Q_p = [Q1 Q2 Q3 Q4 Q5]
Q = mean(Q_p)
if (Q < 50) & (Q > 250);
    q_1 = 0;
    if (Q_p >= 50) & (Q_p < 250);
        q_1 = [Q_p];
        Q = mean(q_1)
    end
end

Q1 = 1.05012447435464

Q2 = 25.3238658780576

Q3 = 26.3238658780576

Q4 = 55.0712183513003

Q5 = 6.7116155293271

q_1 =

1×5 logical array

0 0 0 1 0

Q = 0.2 0.2

I want to get the value of Q4 in numerical form, but it is showing me logical array. What am I doing wrong?

Answer 1

[Walter Roberson]

Q_p = [Q1 Q2 Q3 Q4 Q5]

That is a vector.

    if (Q_p >= 50) & (Q_p < 250);
 

You are testing the vector to see if it is >= 50 and < 250. The test will be considered true only if all of the individual tests come out true.

Note that you do not assign to q_1 if (Q < 50) & (Q > 250) is false.

Answer 2

[Voss]

Q_p = [1.05012447435464, 25.3238658780576, 26.3238658780576, 55.0712183513003, 6.7116155293271]

Q_p = 1×5

1.0501 25.3239 26.3239 55.0712 6.7116

idx = (Q_p >= 50) & (Q_p < 250); % logical index
Q_p(idx)

ans = 55.0712