If and elseif loop

I am trying to say that if f1 is greater than f_st (which is .0667) then calculate T04f using f =.0667.

M = 4;

T_a = 205; %kelvin

P_a = 11.6; %kpa

Q_r = 45000; %Kj/kg

f_st = .0667; % Greater than or equal to used in if loop

T_o4 = 3000; %kelvin

r_d = (1 - (0.1 * ((M-1) ^ 1.5)));

r_fh = 0.97;

r_comb = .95;

n_n = .95;

n_comb = .98;

Me_comb = 0.5;

R = .287; %kJ/Kg*k

gamma1 = 1.4;

gamma2 = 1.3;

cp1= (gamma1 * R) / (gamma1 - 1);

% Equations

p0a_pa = (((1 + (gamma1 - 1) / 2) * (M ^ 2)) ^ (gamma1 / (gamma1 - 1)))

T0a_ta = ((1 + (gamma1 - 1) / 2) * (M ^ 2));

T02 = T_a;

p02_p0a = r_d

p03_p02 = r_fh

T03 = T02;

T04 = 3000; %kelvin

f1 = ((T04-T03) / (((Q_r * n_comb) / cp1) - T04))

if f1 > f_st

f = .0667;

T04f= ((T03 / (1 + f))+(((f / (1 + f)) * ((Q_r * n_comb) / cp1))))

elseif f1 <= f_st

T04f = T04

end

Answer 1

[Cris LaPierre]

See Ch 13 of MATLAB Onramp to learn about if-else statements (they are not loops).

Can you clarify what is or isn't happening that you expected?

In your case, you could use an if-else statement.

if f1 > f_st 
    f = .0667;
    T04f= ((T03 / (1 + f))+(((f / (1 + f)) * ((Q_r * n_comb) / cp1))))
else
    T04f = T04
end