Error in for loop calculation

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Avinav Kumar
Avinav Kumar el 30 de Mzo. de 2021
Editada: Stephen23 el 30 de Mzo. de 2021
Hi, I am getting 0 as answer though the answers cannot be zero. If some one can guide
temperature = 212 ; % temperature in deg F
oilapi = 41 ; % oil API
gamma = (0.00091 * temperature) - (0.0125*oilapi);
gasg = 0.65 ;
U(100)= 100;
for P = 101:2000
U(P) = gasg * U(P-1); %/ (18 * (10 ^ (gamma)))^1.205);
end
U

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Stephen23
Stephen23 el 30 de Mzo. de 2021
Editada: Stephen23 el 30 de Mzo. de 2021
You are confusing data with indices. Do not use data as indices.
temperature = 212 ; % temperature in deg F
oilapi = 41 ; % oil API
gamma = (0.00091 * temperature) - (0.0125*oilapi);
gasg = 0.65 ;
P = 100:2000; % data!
U = P; % data!
for k = 2:numel(U) % indices!
U(k) = gasg * U(k-1); %/ (18 * (10 ^ (gamma)))^1.205);
end
U
U = 1×1901
100.0000 65.0000 42.2500 27.4625 17.8506 11.6029 7.5419 4.9022 3.1864 2.0712 1.3463 0.8751 0.5688 0.3697 0.2403 0.1562 0.1015 0.0660 0.0429 0.0279 0.0181 0.0118 0.0077 0.0050 0.0032 0.0021 0.0014 0.0009 0.0006 0.0004

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