Error in for loop calculation

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Avinav Kumar
Avinav Kumar 2021-3-30
编辑： Stephen23 2021-3-30
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 2021-3-30
编辑：Stephen23 2021-3-30
Ran in:
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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