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Executing the body of IF statement.

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Waseem AL Aqqad 2020-10-12

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编辑： Stephen23 2020-10-12

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Hi,

Why MATLAB is not executing the body of the following selection if statement eventhough I believe the condition is true? Your help would be appreciated!

Note: members is a 1by 3 cell. attack = 5, n1=7

for ii=1:n1   % Check if neighboring nodes will survive the cascading failure or not
   if  ~ismember(ii,members{1}) && ~ii==attack
       A(ii,:)=0;
       A(:,ii)=0;
       C(ii,:)=0; % All nodes in Layer B coupled to neighboring nodes will get failed
       C(:,ii)=0;
   end
 end

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Waseem AL Aqqad 2020-10-12

This is what I did actually before posting this question

Waseem AL Aqqad 2020-10-12

But thanks for sharing that useful page.

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Stephen23 2020-10-12

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编辑：Stephen23 2020-10-12

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Solution: the logic is incorrect:

~ii==attack

should be

ii~=attack

Explanation: the code

~ii==attack

following the rules of operator precedence is equivalant to

(~ii)==attack

which for the case that both ii and attack are non-zero is equivalent to

false==true

which is thus simply equivalent to

false

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Waseem AL Aqqad 2020-10-12

Thank you very much, Stephen!

Waseem AL Aqqad 2020-10-12

Thanks for the explanation.

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