conditional statement with ||
26 次查看(过去 30 天)
显示 更早的评论
Say I have
If A && B && C
...do something if A = B = C = true
end
Is it faster, however to do:
If ~(A || B || C)
..do something if A or B or C = false
end
I am wondering if the latter statement is faster because it should be able break if any of the conditions are false and not test the rest. But I am wondering if the negation forces all of the conditions to be tested first?
0 个评论
采纳的回答
Fangjun Jiang
2011-9-28
If A is false, then A && B will be short-circuited. No need to use the latter approach. Use the first one because it's easy to read.
0 个评论
更多回答(1 个)
Walter Roberson
2011-9-28
The two expressions are not equivalent.
A && B && C
is true only if A and B and C are all true.
~(A||B||C)
is true only if A and B and C are all false, not if one of them is false.
The logical or equivalent of A && B && C is
~(~A || ~B || ~C)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!