How to create a long matrix rapidly

Question

Sergio 2024-1-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2070946-how-to-create-a-long-matrix-rapidly

编辑： Dyuman Joshi 2024-1-17

采纳的回答： Mann Baidi

I would like to create the given matrix

0 1 1 1 1 1 1 1 1 1

1 0 1 1 1 1 1 1 1 1

1 1 0 1 1 1 1 1 1 1

1 1 1 0 1 1 1 1 1 1

1 1 1 1 0 1 1 1 1 1

1 1 1 1 1 0 1 1 1 1

1 1 1 1 1 1 0 1 1 1

1 1 1 1 1 1 1 0 1 1

1 1 1 1 1 1 1 1 0 1

1 1 1 1 1 1 1 1 1 0

I thought of using the command "zeros" for the diagonal, and then use "ones", but "ones" does not exist.

For instance:

m=[0 ones(1,9);0 ones(0,9)....]

But that won't work.

How can I make such a matrix with such "condensed" commands instead of writing it out completely?

Thanks

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Answer 1

Mann Baidi 2024-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/2070946-how-to-create-a-long-matrix-rapidly#answer_1391441

编辑：Mann Baidi 2024-1-17

在 MATLAB Online 中打开

Hi,

Assuming you would like to create a diagonal matrix with the diagonal as '0' and rest elements as '1'.

You can try the following code:

x=~diag(ones(10,1))
x = 10×10 logical array
 1   1   1   1   1   1   1   1   1
 0   1   1   1   1   1   1   1   1
 1   0   1   1   1   1   1   1   1
 1   1   0   1   1   1   1   1   1
 1   1   1   0   1   1   1   1   1
 1   1   1   1   0   1   1   1   1
 1   1   1   1   1   0   1   1   1
 1   1   1   1   1   1   0   1   1
 1   1   1   1   1   1   1   0   1
 1   1   1   1   1   1   1   1   0

For more information on "diag" function, you can refer to the link below:

https://www.mathworks.com/help/matlab/ref/diag.html

Hope this will help in resolving the query!

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Sergio 2024-1-17

Thanks! This is what I looked for indeed.

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Answer 2

Dyuman Joshi 2024-1-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2070946-how-to-create-a-long-matrix-rapidly#answer_1391446

编辑：Dyuman Joshi 2024-1-17

在 MATLAB Online 中打开

ones does exist, but using eye would be easier and faster here -

n = 10;
x = 1 - eye(n)
x = 10×10
   1     1     1     1     1     1     1     1     1
   0     1     1     1     1     1     1     1     1
   1     0     1     1     1     1     1     1     1
   1     1     0     1     1     1     1     1     1
   1     1     1     0     1     1     1     1     1
   1     1     1     1     0     1     1     1     1
   1     1     1     1     1     0     1     1     1
   1     1     1     1     1     1     0     1     1
   1     1     1     1     1     1     1     0     1
   1     1     1     1     1     1     1     1     0