For loop and matrices w/ different elements?

Question

Buster 2021-10-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1573238-for-loop-and-matrices-w-different-elements

评论： Buster 2021-10-27

I have the followling code which has values calculated that are inputs of two matrices A and B. The inputs are values that are calculated in a for loop of i=1:365 corresponding to 1 degree to 360 degrees. I need each value computed by dividing the matrices at each degree/iteration. Everything else works besides the matrix part. I am not including the portions of my code that calculate the inputs but know they are within the for loop

for i=1:360
    
    %All my stuff getting the inputs of the matrices
    
A(i)=[1 0 1 0 0 0 0 0
     0 1 0 1 0 0 0 0
    -R12x(i) R12y(i) -R32y(i) R32x(i) 0 0 0 1
     0 0 -1 0 1 0 0 0
     0 0 0 -1 0 1 0 0 
     0 0 R23y(i) -R23x(i) -R43y(i) R43x(i) 0 0 
     0 0 0 0 -1 0 0 0
     0 0 0 0 0 -1 1 0]
B(i)=[m2.*A2x(i)
    m2.*A2y(i)
    I2*a2
    m3*A3x(i)
    m3*A3y(i)
    I3*a3(i)
    m4*A4x(i)-F4x(i)
    0];
F(i)=A(i).\B(i)
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Buster 2021-10-27

i get the error -"Unable to perform assignment because the left and right sides have a different number of elements"

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

David Hill 2021-10-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1573238-for-loop-and-matrices-w-different-elements#answer_818173

在 MATLAB Online 中打开

B(i)=[m2.*A2x(i);
    m2.*A2y(i);
    I2*a2;
    m3*A3x(i);
    m3*A3y(i);
    I3*a3(i);
    m4*A4x(i)-F4x(i);
    0];%need 8x1 matrix

5 个评论
显示 3更早的评论隐藏 3更早的评论

David Hill 2021-10-27

在 MATLAB Online 中打开

Sorry, need to understand your variables. If you need to store all A matrices, you will need to make a 3-dimensional matrix.

A(:,:,i)=[1 0 1 0 0 0 0 0
     0 1 0 1 0 0 0 0
    -R12x(i) R12y(i) -R32y(i) R32x(i) 0 0 0 1
     0 0 -1 0 1 0 0 0
     0 0 0 -1 0 1 0 0 
     0 0 R23y(i) -R23x(i) -R43y(i) R43x(i) 0 0 
     0 0 0 0 -1 0 0 0
     0 0 0 0 0 -1 1 0];
B(:,i)=[m2.*A2x(i);m2.*A2y(i);I2*a2;m3*A3x(i);m3*A3y(i);I3*a3(i);m4*A4x(i)-F4x(i);0];
F(:,i)=A(:,:,i)\B(:,i);