elseif statement wont execute

The code is to determine outflow from a tank with variable input (hydrograph). The method is usually called chainsaw routing. There are two outlets in the tank, one at 0 elevation, the other at 2 ft. Outlets have different sizes. Naturally I used if and elseif statements to calculate outflow from the two orifices, as the top one does not engage until at least 2 feet of head is reached. However, the elseif statement is not executing; it appears everything just gets calculated from the if statement. One might think that 2 feet of head is never reached, but plot(x,h) shows that head gets to be nearly 8 ft. I am relatively new to coding, and cannot see whats wrong. Please help me find the error

Z = load('routing data.txt') ; 
x = Z(:,1) ; 
I = Z(:,2) ; 
r1 = 1.75; 
r2 = 2.25;  
Aclarifier= 1800; 
Aoutlet1 = pi*(r1/12)^2;
Aoutlet2 = pi*(r2/12)^2;

   for i = 2:length(x)

      h(1) = 0;
      O(1) = 0;
      dh(1) = 0;
      I(1) = 0;
      O1(1) = 0;
      O2(1) = 0;

      dh(i) = (I(i-1)*60*2)/Aclarifier - (O(i-1)*60*2)/Aclarifier; 
      h(i) = dh(i-1)+h(i-1);

      if ( 0 < (h(i)) <= 2)
           O(i) = (.6)*Aoutlet1*sqrt(64.4*h(i)) ; 

      elseif (h(i) > 2)
          O2(i) = (.6)*(Aoutlet2)*sqrt(64.4*(h(i)-2));
          O1(i) = (.6)*(Aoutlet1)*sqrt(64.4*h(i));
          O(i) = O1(i)+O2(i);

      else
          O(i) = 0 ;
          dh(i) = 0;

      end

end

Answer 1

[Walter Roberson]

Recode

if ( 0 < (h(i)) <= 2)

to

if 0 < h(i) && h(i) <= 2

Otherwise the code is interpreted as ((0<h(i)) <= 2) and the first part of that returns a logical value (0 or 1), and 0 and 1 are always <= 2 so the condition was always true.

[Gleb Skljar]

Its still not working; actually, the first statement is not being read either now...

[Jan]

Which one is "the first statement"?

[Walter Roberson]

put a breakpoint in at the "if" and examine h(i), and run the tests by hand such as putting

0 < h(i) && h(i) <= 2

in to the command window.

If your h(i) are for some reason negative, then the "else" branch would be the one activated.

[Gleb Skljar]

problem solved, thanks for the help