Why the third else if condition.. where i==1 && j==m went unexecuted

Question

ravi shukla 2020-8-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/580746-why-the-third-else-if-condition-where-i-1-j-m-went-unexecuted

评论： ravi shukla 2020-8-17

A=zeros(12,1);
n=3;
m=4;
for i=1:n
    for j=1:m
        if (i==1) && (j==1)
            A(1,1)=1;
        elseif (i==1) && (j>1 || j<m)
            A(2,1)=2;
        elseif (i==1) && (j==m) 
            A(3,1)=3;
        end
    end
end
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Answer 1

Cris LaPierre 2020-8-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/580746-why-the-third-else-if-condition-where-i-1-j-m-went-unexecuted#answer_481251

You want the third condition to execute the i==1 and j==4. However, this also meets the conditions of the first elseif:

elseif (i==1) && (j>1 || j<m)

This is because you use "or" instead of "and". When j==4, it is >1. Because of the or, it doesn't matter that it is <m. Try this instead: elseif (i==1) && (j>1 && j<m)