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Using AND Operator in “if” statements

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Hi,
When I type the following code:
if size([1 2 3])==size([4 5 6]) & size([4 5 6])==size([7 8 9])
'yes'
else
'no'
end
MATLAB Code Analyzer issues this warning message: "When both arguments are numeric scalars, consider replacing & with && for performance."
So, I use && instead of &:
if size([1 2 3])==size([4 5 6]) && size([4 5 6])==size([7 8 9])
'yes'
else
'no'
end
But when I run the updated script, MATLAB displays an error message in the Command Window:
??? Operands to the || and && operators must be convertible to logical scalar values.
What can I do to fix this? Thanks in advance.
Andrew DeYoung
Carnegie Mellon University
  7 Commenti
Matt Tearle
Matt Tearle il 11 Mag 2011
You're right about IF and vectors, but the Code Analyzer doesn't necessarily know which variables are vectors and which aren't. The & operator is one instance where it can give a message without having to determine that. The str2num vs str2double message is another example. It's vaguely annoying to get a warning, but the Analyzer's just hedging its bets.
[BTW, I'm just passing on the "official" answer here. I was about to submit a request saying, basically, exactly what you've said. But I found an existing discussion, and I've paraphrased the end decision. I'm sure there's more to it than I can skim and pass along.]
Jenny
Jenny il 2 Ago 2016
Matt, I still use my notes from your class, and thanks for the help in this question. I needed to get this right.

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Risposta accettata

Andrew Newell
Andrew Newell il 10 Mag 2011
The problem is that size returns a vector:
size([1 2 3])
ans =
1 3
Instead, use numel:
if numel([1 2 3])==numel([4 5 6]) && numel([4 5 6])==numel([7 8 9])
disp('yes')
else
disp('no')
end
Or you could use all(size([1 2 3])==size([4 5 6]) etc.
I have also put in the disp commands to take care of the other warnings.

Più risposte (1)

Sean de Wolski
Sean de Wolski il 10 Mag 2011
As an addendum to Andrew's thorough and good solution, you can check the sizes directly:
if(isequal(size([1 2 3]),size([4 5 6])))
disp('yes')
else
disp('no')
end
This will fail if the sizes are not the same but the number of elements (numel) is:
if(isequal(size([1 2 3]),size([4; 5; 6])))
disp('yes')
else
disp('no')
end
  3 Commenti
Matt Tearle
Matt Tearle il 10 Mag 2011
Another benefit to isequal is that it won't throw an error message in situations where == will (it will just return false). For example
if size(rand(2))==size(rand(3,2,2))
disp('yes')
else
disp('no')
end
will fail because size will return a 3-element vector for a 3-D array. However
if isequal(size(rand(2)),size(rand(3,2,2)))
disp('yes')
else
disp('no')
end
works fine.
Andrew Newell
Andrew Newell il 10 Mag 2011
Good point.

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