Index exceeds matrix dimensions

I have the foll. program and when I run it, I get the above error msg i.e. 'Index exceeds matrix dimensions'. Not sure what causes this msg. Please help.

A=[2,2,3,4,5;2,3,6,8,9;3,4,7,6,4;2,9,0,4,5;3,8,7,9,2];
%x=1;
%y=1;
OptimalPath=[2,2];
CurrentPos=[2,2];
min=99;
for x=OptimalPath(end,1)-1:OptimalPath(end,1)+1;
    for y= OptimalPath(end,2)-1:OptimalPath(end,2)+1
        if A(x,y)<min
            min=A(x,y);
        end
        CurrentPos(1)=CurrentPos(1)+x;
        CurrentPos(2)=CurrentPos(2)+y;
        OptimalPath=[OptimalPath;CurrentPos]
    end
end

Answer 1

[Roche de Guzman]

Your y For Loop counter is becoming greater than 5 (the number of columns of your matrix A). Since you are using y for indexing, A(x,y), then you are exceeding the matrix dimensions.

[Star Strider]

Ken’s Comment moved here: (15 Oct 2016 at 00:10 UTC)

Thanks. How to determine that y is the culprit. I tried but could not as it just kept on giving me the same msg. Do you use breakpoints to determine that y is the problem?

[Ken]

Anyone care to respond? Also how to correct this?

[Walter Roberson]

dbstop if error

then run your code. When it stops, examine the size() of each variable being indexed, and examine the value of each of the indexing expressions. The more difficult part is then trying to figure out either how the indexing expression got to be that wrong value, or trying to figure out why the variable being indexed is not as large as expected.

(Hint for the future: if the variable being indexed is not as large as expected, check to see if you are using the / operator somewhere that you need the ./ operator.)