Index exceeds the number of array elements?
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Hello,
I am trying to extract data from Xsteam.I am trying to retrive data with respect to temperature. the code is as follows.
p = 10;
a = 1000;
b = 0.1;
rho_s = zeros(1,((a-1)/b));
L = length(rho_s);
for i = 1:L
T(i)= 1+b*i;
rho_s(i) =XSteam('rho_pT', p, T(i));
drho_s_dT = (rho_s(i+1)-rho_s(i))/(T(i+1)-T(i));
end
when i run this code I am getting an error as "Index exceeds the number of array elements". Can some one check and help me how can I do this.
댓글 수: 6
John Marriott
2020년 5월 27일
Ok - the columns of which variable outputs NaN?- it doesnt return NaN when I run it - are you using the XSteam function posted by Rik?
vishnuvardhan naidu tanga
2020년 5월 27일
편집: vishnuvardhan naidu tanga
2020년 5월 27일
채택된 답변
Ameer Hamza
2020년 5월 27일
It seems that you are trying to find a derivative of rho_s w.r.t. T, you can use gradient() function
p = 10;
a = 1000;
b = 0.1;
rho_s = zeros(1,((a-1)/b));
L = length(rho_s);
T = zeros(1, L);
for i = 1:L
T(i)= 1+b*i;
rho_s(i) =XSteam('rho_pT', p, T(i));
end
drho_s_dT = gradient(rho_s, T);
댓글 수: 2
vishnuvardhan naidu tanga
2020년 5월 27일
편집: vishnuvardhan naidu tanga
2020년 5월 27일
Ameer Hamza
2020년 5월 27일
This is probably caused by the thermodynamical equation implemented in XSteam() and not a MATLAB specific issue. You will need to understand the equations and the implementation of this function to see what might be going wrong. Also, you aren't passing variable 'p' in your code, which might be causing the issue.
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