Create a Matrix with a specific main diagonal

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Adzlxix
Adzlxix 2015-11-30
编辑： Adzlxix 2015-12-12
I want to create a matrix of all one's with the main diagonal of value n.

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采纳的回答

Thorsten
Thorsten 2015-11-30
val = 50; N = 10;
X = diag(repmat(val-1, 1, 10)) + ones(N)

更多回答（3 个）

dpb
dpb 2015-11-30
Multiple ways possible; one--
>> N=5; % diagonal value
>> sz=3; % size
>> m=ones(sz)+diag(repmat(N-1,1,sz))
m =
5 1 1
1 5 1
1 1 5
>>
doc diag % for details on optional arguments for different resulting types
Stephen23
Stephen23 2015-11-30
编辑：Stephen23 2015-11-30
One very simple solution:
>> X = +~eye(4);
>> X(X==0) = 5
X =
5 1 1 1
1 5 1 1
1 1 5 1
1 1 1 5
Andrei Bobrov
Andrei Bobrov 2015-11-30
d = randi(35,5,1);
out = ~eye(5) + diag(d);

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