creating binary vector with determed number of ones

Hello,

i have a vector V= 50; i want to full this vector randomly with 0 and 1. the '1' appears 10 times and the rest of the vector with zeros. how can i do that please

Answer 1

[John D'Errico]

nones = 10;
nv = 50;
V = zeros(1,nv);
V(randperm(nv,nones)) = 1;

[loukil sana]

Thank you.

Sorry i have an other question.

Now if i have a matrix M= (N,L) =(20,30) and i want to allocate some cells of this matrix

exemple: V1 = 1 1 1: means V1 will take a place in the matrix M starting at L=1

1 0 0

v2= 1 1 1 1 : same for this matrix , V2 take place in the matrix M starting at L=1

1 0 0 0 means the first column of V2 will be in the first

1 0 0 0 column of M

[John D'Errico]

I'm sorry. I cannot/will not keep on chasing totally new questions in the comments. That turns one question into an extended personal consulting session. If you have another question, then ask it. AS ANOTHER QUESTION.

[loukil sana]

ok no problem thank you. i will post it as a new question