IQ test, why does matlab see different answers?

Question

Algirdas Kluonius 2012-8-6

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I have simple program which I will use later for more difficult, why do i get different answers for FIND and IF ------------------MATLAB code here-------------------------------------------

clear all, clc
b=0;
d=0;
b=[];
A=rand(5,5);
[r,c]=size(A);
inx=find(A>0.5);
disp(['There are ' num2str(length(inx)) ' no numbers more than 4'])
for i=1:r;
    for j=i:c;
        if A(i,j)>0.5;
            d=d+1;
            b=[b A(i,j)];
        end;
    end;
end;
if d>0;
disp(['There are ' num2str(d) ' numbers more than 4'])
else d==0;
    disp(['There are no numbers more than 4'])
end;

---------------------End of MATLAB code-----------------------------------

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Oleg Komarov 2012-8-6

You can format your code: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

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Answer 1

Kye Taylor 2012-8-6

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在 MATLAB Online 中打开

Your inner loop should run from

j = 1:c

not

j = i:c

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Algirdas Kluonius 2012-8-6

thanks very much, i didn't see that it was i , it solved everything :)

Sean de Wolski 2012-8-6

Please accept the answer that helped you resolve this in order to mark the thread closed.

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Answer 2

Star Strider 2012-8-6

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MATLAB doesn't see different answers, your code does. In your ‘for’ loop you're only seeing the upper triangular part of ‘A’. The ‘find’ function sees the entire ‘A’ matrix.