Initializing all rows with one set of values in one half and another set in the other half

The following line of code works for initializing the first row of an array:

cA(1,:)=[cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)/2-1)];

However, I would like to initialize all rows of the array with this "code". I thought the following would work, but it doesn't.

cA(:,:)=[cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)/2-1)];

MatLab is throwing up an error that it doesn't recognize function or variable 'ones'. How do I initialize all rows in cA with what I originally had for just the first row.

Answer 1

[Walter Roberson]

cA(:,:) = repmat([cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)/2-1)], size(cA,1), 1);

Or consider

nrow = size(cA,1);
cA(:,:) = [cA0*ones(nrow,(N-1)/2+1),Kw/cB0*ones(nrow,(N+1)/2-1)];

Unless cA has some special attributes you want to save, such as you wanting to preserve single(), then you would normally use

nrow = size(cA,1);
cA = [cA0*ones(nrow,(N-1)/2+1),Kw/cB0*ones(nrow,(N+1)/2-1)];

And more generally, you would typically use

mid = ceil(N/2);
cA(:, 1:mid) = cA0;
cA(:, mid+1:N) = Kw/cB0;

Answer 2

[David Hill]

cA=repmat([cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)/2-1)],number_of_rows,1);