Error in for loop calculation

Question

Avinav Kumar 2021-3-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787699-error-in-for-loop-calculation

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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Answer 1

Stephen23 2021-3-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/787699-error-in-for-loop-calculation#answer_662209

编辑：Stephen23 2021-3-30

在 MATLAB Online 中打开

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