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Finding a needle in a matrix

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012786534
012786534 on 12 Apr 2017
Commented: 012786534 on 12 Apr 2017
Hello,
Let's say I have a 10 x 10 matrix filled with numbers (10 X 10 double) which can only be 1, 2 or 3. I need a code that returns an error if there's any other number in there, like say a 4 or an 8. I would have thought that:
if Y ~=1|Y ~=2|Y ~=3
disp('error')
return,
end
would work but it always returns an error message. Any ideas?
Thank you

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Accepted Answer

the cyclist
the cyclist on 12 Apr 2017
Edited: the cyclist on 12 Apr 2017
if not(all(ismember(Y(:),[1 2 3])))
disp('error')
end

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012786534
012786534 on 12 Apr 2017
That's great! Thank you!

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