Can anyone help to see what is wrong with this function to solve a DAE problem
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dx(1)=x(2);
dx(2)=k1*(x(3)-x(1))-(knl_1*x(1)+knl_3*x(1)^3);
dx(3)=x(4);
dx(4)=(-c*x(4)-k1*(x(3)-x(1))+kAmp*cos(w*t)+theta_p*x(5))/m;
dx(5)=(-theta_p*(ks/(kp+ks))*(x(4)-x(2))*R_s-x(5))/R_s/C_p;
The mass matrix
M=diag([1 0 1 1 1]);
options = odeset('mass', M, 'RelTol',1.e-6);
I am trying to solve the equations below. The y values and V values are unknown and the rest of them are constant.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/866945/image.jpeg)
But, it gave out the error
"This DAE appears to be of index greater than 1."
Can anyone help to solve the problem?
Thank you very much.
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