MATLAB: How to create this matrix [1 2 3 4 5;2 2 3 4 5;3 3 3 4 5;4 4 4 4 5;5 5 5 5 5]

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% data
n = 7 % "order"
% engine
x = repmat(1:n,n,1) 
x = max(x, x.')

Added after comment: for non-square matrices:

    n = 4 ; m = 6 ; % n-by-m matrix
    x = max(repmat(1:m,n,1), repmat(1:n,m,1).')

Related Solutions

MATLAB: Sum columns of matrix

>> M = [1,5,2,4,3,2;2,3,1,4,4,1;4,5,2,2,3,1]
M =
   1   5   2   4   3   2
   2   3   1   4   4   1
   4   5   2   2   3   1
>> M(:,1:2:end) + M(:,2:2:end)
ans =
   6   6   5
   5   5   5
   9   4   4
>> reshape(sum(reshape(M.',2,[]),1),[],3).'
ans =
   6   6   5
   5   5   5
   9   4   4

And

>> M = [2,1,2,1,1,5,5,4,4,2,4,5;3,5,1,3,1,2,5,3,3,4,5,4;2,4,2,1,5,5,4,3,2,2,1,5]
M =
   2   1   2   1   1   5   5   4   4   2   4   5
   3   5   1   3   1   2   5   3   3   4   5   4
   2   4   2   1   5   5   4   3   2   2   1   5
>> reshape(sum(reshape(M.',3,[]),1),[],3).'
ans =
    5    7   13   11
    9    6   11   13
    8   11    9    8

MATLAB: Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

Please find the answer of the question asked by me.

Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

m=[];
k=1;
for i=1:n-1
aa=a;
aa(i)=[];
for j=i+1:n
mm=[];
mm=[aa(1:j-1),a(i),aa(j:n-1)];
m(k,:)=mm;
k=k+1;
end
end

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Related Solutions

MATLAB: Sum columns of matrix

MATLAB: Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

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