why elseif (i==1) && j==m condition went unexecuted?

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ravi shukla 2020-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/580722-why-elseif-i-1-j-m-condition-went-unexecuted

编辑： Jan 2020-8-18

A=zeros(12,1);
n=3;
m=4;
for i=1:n
    for j=1:m
        if i==1 && j==m
            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
A

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Answer 1

Jan 2020-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/580722-why-elseif-i-1-j-m-condition-went-unexecuted#answer_481212

编辑：Jan 2020-8-18

The condition "i==1 && j==m" appears twice:

        if i==1 && j==m    % First time
            A(1,1)=1;
        elseif (i==1) && (j>1 || j<m)
            A(2,1)=2;
        elseif (i==1) && (j==m)  % Second time
            A(3,1)=3;
        end        

If the first condition is met already, further elseif branches are not called anymore. The if block is left directly after the first condition is matching and the corresponding block was executed.

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Stephen23 2020-8-17

Welcome back!

Jan 2020-8-18

Hi Stephen, I thought I give it a try. I still cannot unaccept an answer in Firefox, post an image or remove a flag. The auto-editing inserts an "end" if I type an "if". Most likely I have to accept to be tracked by 13 services including facebook, bing, s3.amazonaws and ads-twitter to use Matlab Answers with its full functionality.

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