how to convert struct to sym

Question

sunitha 2021-1-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/722948-how-to-convert-struct-to-sym

编辑： Walter Roberson 2021-1-28

suspended.xlsx

i am solving non linear equations using excel data . but i am getting the error is unable to convert struct to syms can anyone help me ??

syms N J
Qo=xlsread('suspended.xlsx','A:A')
R=xlsread('suspended.xlsx','B:B')
No=xlsread('suspended.xlsx','C:C')
X=xlsread('suspended.xlsx','D:D')
V=24345;
k=1.076;
Kn=0.27
kd=0.04
bs=0.15
Xf=0.49
Df=1.04
Dw=1.3
L=0.04
a=2.24
Y=0.39;
bt=kd+bs
Nstar=N/Kn;
Nmin=Kn/((Y*k/bt)-1);
Lstar=L*(sqrt(k*Xf/Kn*Df))*Df*Dw;
Nstar_min=(1/(Y*k*(bt-1)));
jstar=(J/sqrt(Kn*k*Xf*Df));
nX = size(X,1 );
solutions = cell(1, nX);
for S=1:nX
    solutions{S}=solve(Qo(S)*(1+R(S))*(No(S)-N)-V*(a*J+((X(S)*k*N)/(Kn+N))),(sqrt((Lstar^1.76)+5.2*(Nstar-Nstar_min))-(Lstar^0.88))/2.6==jstar^0.88,N,J)
vpa(solutions{S})
end
celldisp(solutions)

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Answer 1

Walter Roberson 2021-1-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/722948-how-to-convert-struct-to-sym#answer_605548

编辑：Walter Roberson 2021-1-28

在 MATLAB Online 中打开

for S=1:nX
  solutions{S}=solve(Qo(S)*(1+R(S))*(No(S)-N)-V*(a*J+((X(S)*k*N)/(Kn+N))),(sqrt((Lstar^1.76)+5.2*(Nstar-Nstar_min))-(Lstar^0.88))/2.6==jstar^0.88,N,J);
  temp = struct2cell(solutions{S});
  vpa(horzcat(temp{:})) 
end

This will use one column for each variable, but in the general case you will have difficulty figuring out exactly what order the variables will appear in -- and this makes no aattempt to label them on output.