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

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

Answer 1

[Jan]

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.

[Stephen23]

Welcome back!

[Jan]

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.