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How can I solve this ?

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Ba2508
Ba2508 on 18 Dec 2014
Closed: MATLAB Answer Bot on 20 Aug 2021
I have this code to generate the J1 matrix
syms r phi
r=sym('r','real');
phi=sym('phi','real');
N=zeros(3,3+2*nlayers);
Naux1=[1,0,0,r*sin(phi),-r*cos(phi);0,1,0,0,0;0,0,1,0,0];
N(:,1:5)=Naux1
J1=int(r*N'*N,r,R1,R2);
J1=int(J1,phi,0,2*pi)
But I received this error message:
The following error occurred converting from sym to double:
Error using ==> sym.double at 29
DOUBLE cannot convert the input expression into a double array.
If the input expression contains a symbolic variable, use the VPA function instead.
What should I modify ?

Answers (1)

Star Strider
Star Strider on 18 Dec 2014
You didn’t post ‘nlayers’, ‘R1’, or ‘R2’ so we can’t run your code. It is easy enough to integrate only ‘Naux1’ (substituting only it for ‘N=Naux1’ and using symbolic variables for ‘R1’, and ‘R2’).

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