If, ||, && statements

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Dylan Leadbetter
Dylan Leadbetter 2021-4-19
评论： Dylan Leadbetter 2021-4-20
Hi, I was wondering why this bit of code does not work? Im trying to make it so that in a 3x3 matrix, if a row or column or diagonal of 3 is equal to 0, then it prints 'you lose' once.
if Matrix(1,:)=='0'||Matrix(2,:)=='0'||Matrix(3,:)=='0'||Matrix(:,1)=='0'||Matrix(:,2)=='0'||Matrix(:,3)=='0'||(Matrix(1,3)=='0'&&Matrix(2,2)=='0'&&Matrix(3,1)=='0')||(Matrix(1,1)=='0'&&Matrix(2,2)=='0'&&Matrix(3,3)=='0')
fprintf('you lose')
elseif fprintf('its a tie')
end
  2 个评论
Dylan Leadbetter
Dylan Leadbetter 2021-4-19
My code was to create the game tic tac toe and i had to include the character '0' otherwise to would come up with a blank spot in my matrix, not a 0
Dylan Leadbetter
Dylan Leadbetter 2021-4-20
Sorry, i dont understand what you mean by class?

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采纳的回答

Walter Roberson
Walter Roberson 2021-4-19
if Matrix(1,:)=='0'||Matrix(2,:)=='0'||Matrix(3,:)=='0'||Matrix(:,1)=='0'||Matrix(:,2)=='0'||Matrix(:,3)=='0'||(Matrix(1,3)=='0'&&Matrix(2,2)=='0'&&Matrix(3,1)=='0')||(Matrix(1,1)=='0'&&Matrix(2,2)=='0'&&Matrix(3,3)=='0')
Matrix(1,:) is a vector of 3 values, You are comparing all three values to '0', which will give you back a vector of 3 logical values. You then have a || operator, but || can only be used when the left side evaluates to a scalar, and the right side evaluates to a scalar if the left side is false. You need to use all(), such as
if all(Matrix(1,:)=='0')||all(Matrix(2,:)=='0')||all(Matrix(3,:)=='0')
and so on.
Hint:
mask = Matrix == '0';
any(all(mask,1)) || any(all(mask,2))

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