-1 and 1 matrix
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Hello All,
I want to create a n X n matrix with 1row 1, 2nd row -1, 3rd row 1 , 4th row -1 and so on..... can anyone please guide me .......... thanks.........
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Stephen23
2015-5-5
编辑:Stephen23
2015-5-5
Method One:
>> N = 5;
>> 2*mod(ndgrid(1:N,1:N),2)-1
ans =
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
Method Two:
>> 2*(ones(N,1)*mod(1:N,2)).'-1
ans =
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
Method Three:
>> repmat(2*mod(1:N,2).'-1,1,N)
ans =
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
-1 -1 -1 -1 -1
1 1 1 1 1
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