Breaking a Loop to Add Matrices

Question

Chris Dan 2019-11-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/491170-breaking-a-loop-to-add-matrices

回答： Chris Dan 2019-11-18

Hello Guys, I have a small problem regarding loops and matrices addition. I am trying to break the loop and add matrices diagnoally.

The situation is I have a code which adds matrices stored in a struct diagnoally. Here is my code:

S(1).model_data = sparse( rand( 3, 3 )) ;

S(2).model_data = sparse( rand( 3, 3 )) ;

S(3).model_data = sparse( rand( 3, 3 )) ;

S(4).model_data = sparse( rand( 3, 3 )) ;

S(5).model_data = sparse( rand( 3, 3 )) ;

S(6).model_data = sparse( rand( 3, 3 )) ;

C = sparse( rand( 3, 3 )) ;

s = size(S(1).model_data,1); % size of struct

n = size(S,2) ; % number of matrices in the struct

b = s+(s-1)+(n-2)*(s-1); % size of resulting matrix

T = sparse(b,b) % resulting matrix

for k = 1:1:n

for i = 1:1:s

for j = 1:1:s

m =(k-1)*(s-1);

T(i+m,j+m)= T(i+m,j+m) +S(k).model_data(i,j)

end

What I have to do is to run the loop till it reaches S(3), take the result, add C matrix to it diagnoally and then run the loop again to add S(4), S(5) and S(6) to it

so in the end our T matrix would be like:S1+S2+S2+C+S4+S5+S6

We cannot include C matrix in the struct, it HAS to be OUTSIDE of struct.

2 个评论
显示无隐藏无

Mil Shastri 2019-11-14

在 MATLAB Online 中打开

I'm not certain I understand your question correctly, but if I do, you could perfrom matrix addition of S and C_. Something like this:

S  = [1,2,3,4,5,6]
C_ = [0,0,0,10,0,0]
S+C_

ans =

1 2 3 14 5 6

Chris Dan 2019-11-15

this way matrices are not overlapping each other, they should bbe added in way that the last elelment of the first matrix and the first matrix of the second matrix adds up and matrices are placed diagnoally in a bigger matrix

请先登录，再进行评论。

请先登录，再回答此问题。