How to merge matrix in a loop?

Question

Akshay Sahu 2022-10-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1838338-how-to-merge-matrix-in-a-loop

评论： Akshay Sahu 2022-10-29

采纳的回答： David Hill

Suppose I have four matrix

A,B,C and D. These all are (mx3) matrix where m is some number.

and I have to define a number as an user input which is N.

Now I want a merge matrix such that,

for N = 1

New_matrix = [A]

for N = 2

New_matrix = [A

B

C]

for N = 3

New_matrix = [A

B

C

D

A]

for N = 4

New_matrix = [A

B

C

D

A

B

C]

and so on......

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Answer 1

David Hill 2022-10-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1838338-how-to-merge-matrix-in-a-loop#answer_1086353

在 MATLAB Online 中打开

A=randi(10,4,3)
A = 4×3
    10     2     9
     7     7     4
    10     5     1
     5     9     2
B=randi(10,5,3)
B = 5×3
     8     6     1
    10     1     9
     6     5     9
     5     8     8
    10     3     3
C=randi(10,6,3)
C = 6×3
     1     6     4
     9     4     2
     7     5     6
     9     5     4
     3     2     5
     1     2     7
D=randi(10,7,3)
D = 7×3
     5     8     3
     4     9     5
     5     3     9
     6     7     7
     4     9     3
     8     5     6
     7     9     9
N=2;
newMatrix=generateMatrix(A,B,C,D,N)
newMatrix = 15×3
    10     2     9
     7     7     4
    10     5     1
     5     9     2
     8     6     1
    10     1     9
     6     5     9
     5     8     8
    10     3     3
     1     6     4
function newMatrix=generateMatrix(A,B,C,D,N)
n=2*N-1;
s=[size(A,1),size(B,1),size(C,1),size(D,1)];
newMatrix=repmat([A;B;C;D],ceil(n/4),1);
S=sum(s*floor(n/4))+sum(s(1:mod(n,4)));
newMatrix=newMatrix(1:S,:);
end

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Akshay Sahu 2022-10-29

Thank you @David Hill, your algorithm worked as I want.

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Answer 2

KALYAN ACHARJYA 2022-10-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1838338-how-to-merge-matrix-in-a-loop#answer_1086338

编辑：KALYAN ACHARJYA 2022-10-28

在 MATLAB Online 中打开

% Just example
A=rand(4,3);
B=rand(4,3);
C=rand(4,3);
D=rand(4,3);
data_mat={A,B,C,D}; % Created to handle data easily
N=4 ; % Example or length of data_mat
data=cell(1,N); %Memory Pre-allocation
for i=1:N
    data{i}=horzcat(data_mat{1:i});
end 
data
data = 1×4 cell array
    {4×3 double}    {4×6 double}    {4×9 double}    {4×12 double}