MATLAB: Find a command that will generate a pseudo-random number(random number) that lies bwtween -1 and 1 drawn from uniform distribution

random number generator

Hi I am trying to find a command that will generate a pseudo-random number(random number) that lies between -1 and 1 drawn from uniform distribution.

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You haven't looked very far, rand is what you want:

n = 2 * rand(1, 1000) - 1; %generate 1000 numbers between -1 and 1

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MATLAB: Random numbers

help rand
doc rand

MATLAB: Uniformly distributed pseudo-random numbers

To do what you ask would require the result vector to have 145, not 144, elements, unless the vector is considered circular with the first element regarded as following the last element. In the following code you can have your choice since the last element in B always equals the first element. You can either leave B as is with its 145 elements or you can delete the last element, depending whether the vector is to be considered circular.

n = 12;
b = true;
while b
  A = zeros(n);
  B = zeros(n^2+1,1);
  j = ceil(n*rand);
  B(1) = j;
  for k = 1:n^2
    f = find(A(:,j)==0);
    m = length(f);
    if m == 0
      break;
    else
      i = f(ceil(m*rand));
      A(i,j) = k;
      j = i;
      B(k+1) = j;
    end
  end
  b = any(any(A==0));
end

This is not highly efficient code since it continues to repeat the while loop until it succeeds in completing the vector B with the requested property. This usually takes a number of trials. When it succeeds, the vector B will have one occurrence of each possible pairing of successive elements, and since the 'rand' function is used in this placement, B can be considered random in a sense.

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Related Solutions

MATLAB: Random numbers

MATLAB: Uniformly distributed pseudo-random numbers

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