How can I do this matrix ?

2018 2 20
1 个回答
回答已采纳
更新时间：2018 2 21
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I have this Matrix
A=[1;6;9;4;2;8]
I would like to generate a matrix as follow
the first row has only 1 and the rest zeros.
the seconds row has 1 and 6 and the rest zeros
the third has 1 , 6 and 9 and the rest zeros and so one
B=
1 0 0 0 0 0
1 6 0 0 0 0
1 6 9 0 0 0
1 6 9 4 0 0
1 6 9 4 2 0
1 6 9 4 2 8
How can I do it ?

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Stephen23
Stephen23 2018-2-20
编辑：Stephen23 2018-2-20

1 个投票

>> A = [1;6;9;4;2;8];
>> M = tril(repmat(A.',6,1))
M =
1 0 0 0 0 0
1 6 0 0 0 0
1 6 9 0 0 0
1 6 9 4 0 0
1 6 9 4 2 0
1 6 9 4 2 8

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zeezo
zeezo 2018-2-20
Thank you very much
zeezo
zeezo 2018-2-20
Now If i want to just select a small matrix from this matrix
1 0 0 0 0 0
1 6 0 0 0 0
1 6 9 0 0 0
1 6 9 4 0 0
1 6 9 4 2 0
1 6 9 4 2 8
just 3*3
C=
1 0 0
1 6 0
1 6 9
How Can I do it ?
zeezo
zeezo 2018-2-21
Thanks a lot

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