how to generate the matrix of (50,100) with its diagonal alone having values

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Prabha Kumaresan 2018-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/375964-how-to-generate-the-matrix-of-50-100-with-its-diagonal-alone-having-values

编辑： Stephen23 2018-1-7

采纳的回答： Stephen23

how to generate the matrix of (50,100) with its diagonal alone having values

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Stephen23 2018-1-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/375964-how-to-generate-the-matrix-of-50-100-with-its-diagonal-alone-having-values#answer_299013

在 MATLAB Online 中打开

Method one: indexing:

M = zeros(50,100);
M(1:51:50^2) = V % vector V must have 50 elements

A simple example:

>> M = zeros(5,10);
>> M(1:6:25) = 1:5
M =
   1   0   0   0   0   0   0   0   0   0
   0   2   0   0   0   0   0   0   0   0
   0   0   3   0   0   0   0   0   0   0
   0   0   0   4   0   0   0   0   0   0
   0   0   0   0   5   0   0   0   0   0

Method two: diag:

[diag(V),zeros(50)] % vector V has 50 elements

and an example:

>> [diag(1:5),zeros(5)]
ans =
 0   0   0   0   0   0   0   0   0
 2   0   0   0   0   0   0   0   0
 0   3   0   0   0   0   0   0   0
 0   0   4   0   0   0   0   0   0
 0   0   0   5   0   0   0   0   0

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Prabha Kumaresan 2018-1-7

thanks this was the result i expected.

Stephen23 2018-1-7

编辑：Stephen23 2018-1-7

@Prabha Kumaresan: if this is what you need then please remember to accept the answer that helps you most. We are volunteers, and accepting is the easiest way for you to show your appreciation for their time spent helping you.

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