Generating a number with specific number of times.

Is there any better way to perform these in matlab? eg:
i) Generating a number with specific number of times.

a=[1 2 3 4 5];  %The data
  b=cell(10,1);
  for i=1:3       %Each data will appear a specific number of times
      b{i}=a(1);
  end
  for j=1:1
      b{j+i}=a(2);
  end
  for k=1:2
      b{k+j+i}=a(3);
  end
  for l=1:1
      b{l+k+j+i}=a(4);
  end
  for m=1:3
      b{m+l+k+j+i}=a(5);
  end
  c=b;        %Store the processed data into a variable.

Answer 1

[Image Analyst]

No need to make it complicated with a cell array when a normal numerical array will work just fine:

a=[1 2 3 4 5];
counts = [3, 1, 2, 1, 3]
b = [];
for k = 1 : length(a)
  b = [b, a(k) * ones(1, counts(k))];
end
b

Results in command window

b =
     1     1     1     2     3     3     4     5     5     5