what's the difference between | and || in matlab??

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maha ismail
maha ismail 2014-12-10
评论： Steve Van Hooser 2024-12-2，15:04
what's the difference between | and || in matlab??

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matt dash
matt dash 2014-12-10
移动：Stephen23 2024-3-19
Clarification: for short circuit "and" no tests are evaluated after the first "false". For short circuit "or" no tests are evaluated after the first true.

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Sean de Wolski
Sean de Wolski 2014-12-10
编辑：Sean de Wolski 2014-12-10
| applies to each element in the array, || applies to a scalar condition:
[1 0 1] | [ 0 0 1]
v.
[1 0 1] || [ 0 0 1]
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DGM
DGM 2024-12-2，14:52
编辑：DGM 2024-12-2，14:53
Ran in:
I hate to nitpick, but I'm bored and have a minor tweak to add:
The || is a scalar operator, and the | operator is elementwise; that's true. The problem is describing what's expected of an elementwise operator's output size (at least if we're going to explicitly describe it in the context of an ancient question).
Now if we're living in 2014, then the statement that the output is the same size as the input would be true. In the present day, the size of the output of an elementwise operator isn't necessarily the same size as the input. That's only the case when the two inputs are the same size.
Assuming that the inputs have compatible size, the output size is the maximum of input sizes (assuming we're using R2016b or newer (or are using bsxfun() in older versions)).
[1 0 1] | [0 0 1] % output is 1x3
ans = 1x3 logical array
1 0 1
[1 0 1] | [0 0 1].' % output is 3x3
ans = 3x3 logical array
1 0 1 1 0 1 1 1 1
Even without this addendum, I think that @Steve Van Hooser's comment is a more meaningful answer than the original. The short-circuit functionality is really secondary to the fact that || is scalar.
Steve Van Hooser
Steve Van Hooser 2024-12-2，15:04
Nice addition. I don't see how to give a thumbs up so I will do it in words.

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