Using Cell Arrays to Store a Matrix Each Time Through a Loop

Question

Kyle Fertig 2017-12-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/370932-using-cell-arrays-to-store-a-matrix-each-time-through-a-loop

评论： Kyle Fertig 2017-12-4

I'm looking to store the value "p" (3x1 matrix) found each time going through a loop. In my code below, I attempt to use a cell array through the line "M{i}=p" where i is the value increasing by 1 each time I go through the loop. What I'm finding is that the cell is made, but instead of putting the second loop in the second cell, it just overwrites p in the same first cell. I appreciate any help in fixing this!

Thanks,

-Kyle

 %%Taking Apart Identity Matrix
L=[1,0,0;2.56,1,0;5.76,3.5,1]
U=[25,5,1;0,-4.8,-1.56;0,0,0.7]
w=length(L)
I=eye(w)
b=[1;0;0]
n=length(L)
M=cell(1,n)
for i=1:w
    b=I(:,i)
    %%Gauss Elim L
    n=length(L);
    m=zeros(n,1);
    x=zeros(n,1);
    for k =1:n-1;
          %compute the kth column of M
          m(k+1:n) = L(k+1:n,k)/L(k,k);
          %compute
          %An=Mn*An-1;
          %bn=Mn*bn-1;
          for i=k+1:n
              L(i, k+1:n) = L(i,k+1:n)-m(i)*L(k,k+1:n);
          end;
          b(k+1:n)=b(k+1:n)-b(k)*m(k+1:n);
    end
    W= triu(L);
    %BACKWARD ELIMINATION
    x(n)=b(n)/L(n,n);
    for k =n-1:-1:1;
          b(1:k)=b(1:k)-x(k+1)* W(1:k,k+1);
          x(k)=b(k)/W(k,k)
    end
    %%Gauss Elim U
    n=length(U);
    m=zeros(n,1);
    p=zeros(n,1);
    for k =1:n-1;
          %compute the kth column of M
          m(k+1:n) = U(k+1:n,k)/U(k,k);
          %compute
          %An=Mn*An-1;
          %bn=Mn*bn-1;
          for i=k+1:n
              U(i, k+1:n) = U(i,k+1:n)-m(i)*U(k,k+1:n);
          end;
          x(k+1:n)=x(k+1:n)-x(k)*m(k+1:n);
    end
    W= triu(U);
    %BACKWARD ELIMINATION
    p(n)=x(n)/U(n,n);
    for k =n-1:-1:1;
          x(1:k)=x(1:k)-p(k+1)* W(1:k,k+1);
          p(k)=x(k)/W(k,k)
    end
 M{i}=p
end

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Answer 1

Jos (10584) 2017-12-4

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/370932-using-cell-arrays-to-store-a-matrix-each-time-through-a-loop#answer_294557

You have multiple iterations using an iterator i ... I suggest to use more descriptive variable names :D

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Kyle Fertig 2017-12-4

THANK YOU SO MUCH! Being totally honest, this code is a combination of a bunch of little things I've written and stuff I've found on the internet. I didn't even notice i was redefined later in the code.

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