Create a Matrix - Replace elements of a Matrix

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Konstantinos 2014-12-13

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评论： Konstantinos 2014-12-13

I want to create a row of a matrix which consist of 16 zeros and random replace 4 of the first 8 elements with ones and 2 of the last 8 elements with ones.

i.e A = [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ;]

Then B= [ 1 0 0 1 1 0 0 1 0 0 1 0 0 1 0 0 ; ]

The ones should be replaced randomly in their positions as explained before.

Any help could be useful.

Thanks in advance !

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Azzi Abdelmalek 2014-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/166487-create-a-matrix-replace-elements-of-a-matrix#answer_162227

在 MATLAB Online 中打开

A = [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
B=A
B([randperm(8,4) randperm(8,2)+8])=1

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Azzi Abdelmalek 2014-12-13

在 MATLAB Online 中打开

You can write

A=zeros(1,16)

instead of

A = [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]

Konstantinos 2014-12-13

Indeed...my problem was that I didn't know the existance of "randperm" command.

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