What s the difference between and in MATLAB

Question

What is the difference between the  amp  and  amp  amp  logical operators in MATLAB

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amp  is a logical elementwise operator  while  amp  amp  is a logical short-circuiting operator  which can only operate on scalars   For example  pardon my syntax   If   A    True True False True  B   False A  amp  B    False False False False     or   B   True A  amp  B    True True False True   For  amp  amp   the right operand is only calculated if the left operand is true  and the result is a single boolean value  x    b    0   amp  amp   a b  gt  18 5  Hope that s clear

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Both are logical AND operations   The  amp  amp  though  is a  short-circuit  operator   From the MATLAB docs      They are short-circuit operators in that they evaluate their second operand only when the result is not fully determined by the first operand    See more here

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The single ampersand  amp  is the logical AND operator   The double ampersand  amp  amp  is again a logical AND operator that employs short-circuiting behaviour  Short-circuiting just means the second operand  right hand side  is evaluated only when the result is not fully determined by the first operand  left hand side   A  amp  B  A and B are evaluated   A  amp  amp  B  B is only evaluated if A is true

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amp  amp  and    are short circuit operators operating on scalars    amp  and   operate on arrays  and use short-circuiting only in the context of if or while loop expressions

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A good rule of thumb when constructing arguments for use in conditional statements  IF  WHILE  etc   is to always use the  amp  amp     forms  unless there s a very good reason not to   There are two reasons      As others have mentioned  the short-circuiting behavior of  amp  amp     is similar to most C-like languages  That similarity   familiarity is generally considered a point in its favor  Using the  amp  amp  or    forms forces you to write the full code for deciding your intent for vector arguments   When a    1 0 0 1  and b    0 1 0 1   is a amp b true or false   I can t remember the rules for MATLAB s  amp   can you   Most people can t   On the other hand  if you use  amp  amp  or     you re FORCED to write the code  in full  to resolve the condition      Doing this  rather than relying on MATLAB s resolution of vectors in  amp  and    leads to code that s a little bit more verbose  but a LOT safer and easier to maintain

User · Answer

amp  amp  and    take scalar inputs and short-circuit always     and  amp  take array inputs and short-circuit only in if while statements   For assignment  the latter do not short-circuit   See these doc pages for more information

User · Answer

As already mentioned by others   amp  is a logical AND operator and  amp  amp  is a short-circuit AND operator  They differ in how the operands are evaluated as well as whether or not they operate on arrays or scalars     amp   AND operator  and    OR operator  can operate on arrays in an element-wise fashion   amp  amp  and    are short-circuit versions for which the second operand is evaluated only when the result is not fully determined by the first operand  These can only operate on scalars  not arrays

[matlab] What's the difference between & and && in MATLAB?

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