create a binary sequence that consisting of m zeros and n ones in any order.

I need help to program a matlab code to generate a binary sequence that contains m zeros and n ones. I created a N lengths of zero, x1=zeros(1,N), but how to add n ones into the sequence of zeros.

Answer 1

[Star Strider]

The easiest way:

x1 = [zeros(1,N)  ones(1,M)];

[Bear]

Thx alot and it works well, but I forgot to say the zeros and ones have to be placed in random order. Do you have any ideas how to do this.

Answer 2

[Roger Stafford]

Or perhaps you want them in random order:

   x = zeros(1,m+n);
   p = randperm(1:m+n,n);
   x(p) = ones(1,n);

[Bear]

Yes, I want them in random order, but there is something wrong with your 2nd line above there.

[Image Analyst]

You may have an old version where randperm() did not allow a second input argument. Please upgrade.

[Azzi Abdelmalek]

There is an error in

p = randperm(1:m+n,n);

[Roger Stafford]

Yes, it should have been

   p = randperm(m+n,n);

Answer 3

[Azzi Abdelmalek]

x1=[zeros(1,5) ones(1,4)]

%or

N=5;
n=4;
X1=1:n+N>N

[Bear]

Thank you and it works well, but I forgot to say the zeros and ones have to be placed in random order. Do you have any ideas how to do this.

[Azzi Abdelmalek]

N=5;
M=4;
X1=zeros(1,N+M);
X1(randperm(N+M,M))=1

[Bear]

Thank you. That was what I asked for.

[Bear]

There is a question on my further programming this code, For example, m=n=2. then the number of combinations of the binary sequence is 6,nchoosek(4,2). My code was fine to output the 6 combinations. However, the combinations are not unique. one or two combinations show twice. Here is the detail of question, you may want to click and take a look. generate the binary sequence Again, thank you for the great helps.

Answer 4

[Jan]

And another apporach:

x1 = zeros(1, n+m);
x1(n+1:n+m) = 1;