Info

此问题已关闭。 请重新打开它进行编辑或回答。

How can I solve this ?

1 次查看（过去 30 天）
Ba2508
Ba2508 2014-12-18
关闭： MATLAB Answer Bot 2021-8-20
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 ?

请先登录，再回答此问题。

回答（1 个）

Star Strider
Star Strider 2014-12-18
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’).

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by