Random Binary Matrix with certain weight

Question

Moe Joe 2016-11-25

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评论： John BG 2016-12-1

In leaner codes (n,k), I want to generate a random binary matrix of size (1, n) with weight (t)

I can use A = randi ([0 1], 1, n); OR A=fix(2*rand(1,n));

But this will generate a matrix A of different weights. To get a vector of weight (t), will need exhaustive search which is time-consuming.

I need a command that can generate this matrix or vector of weight (t) distributed randomly in A=(1,n).

Can you help pls?

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Answer 1

Walter Roberson 2016-11-25

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在 MATLAB Online 中打开

v = [ones(1,t), zeros(1,n-t)];
A = v( randperm(n) );

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Moe Joe 2016-11-26

Thanks a Million dear Walter.

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Answer 2

John BG 2016-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/313997-random-binary-matrix-with-certain-weight#answer_244737

在 MATLAB Online 中打开

Moe

the weight function that you may be asking for is the shape of

w=randperm(numel(nA))/sum(nA)

this w is only an example, but the key point you need to have in the weight vector is

sum(w)
=
1

I understand that because you add time dependency to the weight vector w, this is going to change, so fast does w change?

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>

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Moe Joe 2016-11-26

编辑：Moe Joe 2016-11-26

No dear, t is not time, it refers to the number of errors in the Victor of length n. The idea is to generate a Victor of length n, and weight t. The answer of Walter is perfect. I appreciate both of you.

John BG 2016-12-1

good to know, next time please give all question related in one go, not by instalments, will you?

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