What is wrong with this code?

I'm trying to execute a set of elseif statements, but the third condition is not being recognized. Even when the value of v(i) is between vr and vco, the statement is returning the answer for the second condition.

for i=1:8760
    if v(i)<vci || v(i)>vco
        P(i)=0;
    elseif vci<=v(i)<vr
        P(i)=(0.5*1.225*18146*0.45*(v(i)^3))/10^3;
    elseif vr<=v(i)<=vco
        P(i)=Prated;
    end
end

Answer 1

[Andrei Bobrov]

for ii = 1:8760
    if v(ii)<vci || v(ii)>vco
        P(ii)=0;
    elseif vci<=v(ii) && v(ii)<vr
        P(ii)=(0.5*1.225*18146*0.45*(v(ii)^3))/10^3;
    elseif vr<=v(ii) && v(ii)<=vco
        P(ii)=Prated;
    end
end

[Vaishnav Pushpoth]

That worked! I'm new to matlab. Thanks for helping me out.