Could anyone help me how to write the matrix with respect to diagnol in the for loop.

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Prabha Kumaresan 2018-1-8

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关闭： MATLAB Answer Bot 2021-8-20

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If i run the following code

N_UE=[2 4 6 8 10];
N_SC=[12 14 16 18 20];
for t= 1:length(N_UE)
for r= 1:length(N_UE)
G=rand(N_UE(t),N_SC(r))
C=[diag(1:N_UE(t)),diag(1:N_SC(r))]
end
end

it results in Error using horzcat Dimensions of matrices being concatenated are not consistent.

Error in (line 6) C=[diag(1:N_UE(t)),diag(1:N_SC(r))]

Could anyone help me to solve it.

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KSSV 2018-1-9

Why don't you give an matrix example...you are expecting, instead of code with errors?

Prabha Kumaresan 2018-1-9

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C1=[1     0     1     0     1     0     1     0     1     0     1     0;
    0     2     0     2     0     2     0     2     0     2     0     2]
C2=[1     0     0     0     1     0     0     0     1     0     0     0     1     0;
    0     2     0     0     0     2     0     0     0     2     0     0     0     2;
    0     0     3     0     0     0     3     0     0     0     3     0     0     0;
    0     0     0     4     0     0     0     4     0     0     0     4     0     0]

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回答（2 个）

Rik 2018-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/376084-could-anyone-help-me-how-to-write-the-matrix-with-respect-to-diagnol-in-the-for-loop#answer_299305

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I'll add my solution as a separate answer to avoid confusion.

m=[2 4 6 8 10];
n=[12 14 16 18 20];
iwant = cell(length(m),1) ;
for t= 1:length(m)
    n_=ceil(n(t)/m(t));%round up to nearest multiple
    C=repmat(diag(1:m(t)),1,n_);
    iwant{t}=C(:,1:n(t));%crop back to only needed cols
end

For me this just executes as expected. The fourth run yields an 8x18 matrix:

0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0
2 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 2
0 3 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0
0 0 4 0 0 0 0 0 0 0 4 0 0 0 0 0 0
0 0 0 5 0 0 0 0 0 0 0 5 0 0 0 0 0
0 0 0 0 6 0 0 0 0 0 0 0 6 0 0 0 0
0 0 0 0 0 7 0 0 0 0 0 0 0 7 0 0 0
0 0 0 0 0 0 8 0 0 0 0 0 0 0 8 0 0

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Rik 2018-1-10

You should find the button to accept an answer right next to or below the profile picture of the person supplying the answer.

Walter Roberson 2018-1-10

Rik, it was not jaah who asked the Question so jaah would not be able to Accept the answer.

KSSV 2018-1-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376084-could-anyone-help-me-how-to-write-the-matrix-with-respect-to-diagnol-in-the-for-loop#answer_299261

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k = [1 2] ;
C = diag(k) ;
C1 = repmat(C,1,6) ;
k = [1 2 3 4] ;
C = diag(k) ;
C2 = repmat(C,1,3) ;
C21 = diag([1 2]) ;
C22 = zeros(2) ;
C212 = [C21 ; C22] ;
C2 = [C2 C212] ;