# unexpected object of type 'RootOf'

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Hi everyone, I am trying to perform a simple curvefitting, but Matlab keeps throwing this error message at me. Does anyone know whats the issue?

It is weird that I only encounter this problem when I try to work with the function Aufheiz6Var, but I get no issues when working with Aufheiz4var and Aufheiz2Var, they are almost exactly the same functions but just different equations.

Error using symengine

Code generation failed due to unexpected object of type

'RootOf'.

res1 = mupadmex('symobj::generateMATLAB',r.s,ano,spa,splitIt);

r = mup2mat(c{1},true,sparseMat,false);

body = mup2matcell(funs, opts.Sparse);

gs=matlabFunction(ilaplace(Zges*rect))

bx=@(start)Aufheiz6var(Res(i-2),Res(i-1),Res(i),Cap(i-2),Cap(i-1),start,Zth,time(i,:),aufheizdauer);

fv(:,1) = funfcn(x,varargin{:});

if i==2

Zth=temp(i,:)/PHI;

Res(i)=Zth(aufheizdauer)-Res(i-1);

bx=@(start)Aufheiz4var(Res(i-1),Res(i),Cap(i-1),start,Zth,time(i,:),aufheizdauer);

AufheizParameter=fminsearch(bx,start);

Cap(i)=AufheizParameter;

end

if i==3

Zth=temp(i,:)/PHI;

Res(i)=Zth(aufheizdauer)-Res(i-1)-Res(i-2);

bx=@(start)Aufheiz6var(Res(i-2),Res(i-1),Res(i),Cap(i-2),Cap(i-1),start,Zth,time(i,:),aufheizdauer);

AufheizParameter=fminsearch(bx,start);

Cap(i)=AufheizParameter;

end

function A=Aufheiz6var(R1,R2,R3,C1,C2,C3,Zth,xm,aufheizdauer)

syms s

Z3=R3/(R3*C3*s+1);

Z2=(R2+Z3)/((R2+Z3)*C2*s+1);

Z1=R1+Z2;

Zges=1/(s*C1+1/Z1);

rect=(1-exp(-s*aufheizdauer))/s;

gs=matlabFunction(ilaplace(Zges*rect))

A=sum((gs(xm)-Zth).^2);

clf;

plot(xm,Zth,'b');

hold on;

plot(xm,gs(xm),'r');

drawnow

end

function A=Aufheiz4var(R1,R2,C1,C2,Zth,xm,aufheizdauer)

syms s

Z2=R2/(R2*C2*s+1);

Z1=R1+Z2;

Zges=1/(s*C1+1/Z1);

rect=(1-exp(-s*aufheizdauer))/s;

gs=matlabFunction(ilaplace(Zges*rect));

A=sum((gs(xm)-Zth).^2);

clf;

plot(xm,Zth,'b');

hold on;

plot(xm,gs(xm),'r');

drawnow

end

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### Accepted Answer

Paul
on 18 Jul 2022

##### 7 Comments

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