-1 and 1 matrix

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Offroad Jeep 2015-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/215153-1-and-1-matrix

评论： Andrei Bobrov 2015-5-5

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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Answer 1

Stephen23 2015-5-5

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编辑：Stephen23 2015-5-5

在 MATLAB Online 中打开

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