MATLAB: Random number generation for known sum

rand

i what do generate some 15 random numbers that sum for each separate value of say, 60 , 70, 40, 65. How would i go abouts this?

sum = [60 70 40 65];
n=15;
b = [ ];
for i = 1:1:n,
a = randi([1,??]);
b = [b a];
end

Best Answer

n=60;
m=1:n;
a=m(sort(randperm(60,15)));
b=diff(a);
b(end+1)=60-sum(b)
sum(b)

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MATLAB: Conditional Random number generation

   function R = randfixedsumint(m,n,S);
   % This generates an m by n array R.  Each row will sum to S, and
   % all elements are all non-negative integers.  The probabilities
   % of each possible set of row elements are all equal.
   % RAS - Mar. 4, 2017
   if ceil(m)~=m|ceil(n)~=n|ceil(S)~=S|m<1|n<1|S<0
    error('Improper arguments')
   else
    P = ones(S+1,n);
    for in = n-1:-1:1
     P(:,in) = cumsum(P(:,in+1));
    end
    R = zeros(m,n);
    for im = 1:m
     s = S;
     for in = 1:n
      R(im,in) = sum(P(s+1,in)*rand<=P(1:s,in));
      s = s-R(im,in);
     end
    end
   end
   return

MATLAB: How to Generate a random real number in the range (0, 20)

N = 100 ;
a = 0;
b = 20;
r = (b-a).*rand(N,1) + a;

Best Answer

Related Solutions

MATLAB: Conditional Random number generation

MATLAB: How to Generate a random real number in the range (0, 20)

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