Nested while loop problem

Hi,

I have a test matrix [1 2 3; 4 5 6; 7 8 9] which I provide as input to a function called sandbox. The function is included below:

    function [matchFound] = sandbox(input)

    i=1; j=1; matchFound=[];
    while (i<=size(input,1)) && (isempty(matchFound))
        while (j<=size(input,2)) && (isempty(matchFound))
            if input(i,j)==5
                matchFound=1;
            end
            j=j+1;
        end
        i=i+1;
    end
    end

When I set i=1 in the second line the output is matchFound=[]; but when I set i=2 the output becomes matchFound=1. I have no clue why this happens. Could someone please help?

Best wishes

[Walter Roberson]

It is recommended that you do not name a variable "input" as doing so interferes with the MATLAB function input()

Answer 1

[Walter Roberson]

You did not reset j to 1 when you start the next iteration of "i".