i want to write shorter code

b=[0 1 1 0 0]

b = 1×5

0 1 1 0 0

n=numel(b);
c=b'

c = 5×1

0 1 1 0 0

repmat(b,n,1)

ans = 5×5

0 1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 1 1 0 0

repmat(c,1,n)

ans = 5×5

0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0

repmat(b,n,1)|repmat(c,1,n)

ans = 5×5 logical array
   0   1   1   0   0
   1   1   1   1   1
   1   1   1   1   1
   0   1   1   0   0
   0   1   1   0   0

Answer 1

[Voss]

b=[0 1 1 0 0]

b = 1×5

0 1 1 0 0

b|b.'

ans = 5×5 logical array
   0   1   1   0   0
   1   1   1   1   1
   1   1   1   1   1
   0   1   1   0   0
   0   1   1   0   0

[Bruno Luong]

b|b'

is even shorter. ;-)

[Voss]

@Bruno Luong: Very good! And it works the same, since | won't accept non-real operands.

@Luca Re: In case you are interested in the difference:

% when b is real, 
b = [0 1 1 0 0];
% b' (complex conjugate transpose) and b.' (transpose) are the same
isequal(b',b.')

ans = logical
   1

% when b is non-real,
b = [0 1i 1 0 0];
% b' and b.' are different
isequal(b',b.')

ans = logical
   0

% but it doesn't matter in this case because | (or) can't deal with
% non-real operands
try
    b|b'
catch e
    disp(['error: ' e.message])
end

error: Operands must be real.

try
    b|b.'
catch e
    disp(['error: ' e.message])
end

error: Operands must be real.

% so for b|b.' (or b|b') to work, b must be real, in which case 
% b.' is the same as b' as shown above

https://www.mathworks.com/help/matlab/ref/transpose.html

https://www.mathworks.com/help/matlab/ref/ctranspose.html