MATLAB: Marking indexes

Question

x=[1 7 12 16];
y=zeros(1,20);

I want to show 1 in y at x valued indices.. i.e,

y(1)=1
y(7)=1
y(12)=1
y(16)=1
y(for all)=0

how I can stem it automatically without manually zero padding ?

Answer 1

I think that all you want to do is this:

    x = [ 1 7 12 16 ];
    y = zeros(1,20);
    y(x) = 1

If y is rather large, you can create a SPARSE matrix:

    y = sparse(1,20);
    y(x) = 1