i want to write shorter code

Question

Luca Re 2023-9-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2015916-i-want-to-write-shorter-code

编辑： Voss 2023-9-1

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

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Answer 1

Voss 2023-9-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2015916-i-want-to-write-shorter-code#answer_1299666

在 MATLAB Online 中打开

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

2 个评论
显示无隐藏无

Bruno Luong 2023-9-1

在 MATLAB Online 中打开

b|b'

is even shorter. ;-)

Voss 2023-9-1

编辑：Voss 2023-9-1

在 MATLAB Online 中打开

@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