Generate random integers with a condition

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matA.mat

Hi all,

I have a matrix A 84x1 (attached). I need to replace ZEROS by randi(3). However, I need to ensure that the number of 1s, 2s or 3s does not exceed 33.

Hope the problem is clear.

Thank you

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N/A 2018-3-7

Thanks for your response. Number of 1s, 2s and 3s for each values, i.e. I cannot have more than 33 1s or 33 2s or 33 3s. All zeros are to be replaced by an individual random value

Thanks

Jan 2018-3-7

I've adjusted the code. See [EDITED]

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Answer 1

Jan 2018-3-7

编辑：Jan 2018-3-7

在 MATLAB Online 中打开

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% [EDITED] after the comment:
A  = randi([0,5], 84, 1);
z  = (A == 0);
nz = sum(z);
ready = false;
while ~ready
  A(z)  = randi(3, nz, 1);
  ready = sum(A==1) < 33 && sum(A==2) < 33 && sum(A==3) < 33;
end

To be sure, add a maximum number of loops. Better stop with an error than run an infinite loop:

count = 0;
while ~ready && count < 1e6
  ...
  count = count + 1;
end
if count == 1e6
   error('Cannot find matching values.')
end

A constructive method might be better also: Create a pool with 32 1s, 2s and 3s, and select the elements randomly out of this pool:

pool  = repelem(1:3, 32);
index = randperm(numel(pool), nz);
value = pool(index);

Now the vector value must contain less than 33 ones, twos or threes.

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N/A 2018-3-7

Thanks for your insights. Creating a pool and selecting the elements randomly out of this pool is a good point

N/A 2018-3-7

Works perfectly! Cheers!

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Generate random integers with a condition

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Generate random integers with a condition

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