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creating a max-pooling layer using nested loop.

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I am trying to make a max pooling layer with a 3x3 filter and stride 3. I'm trying to only use for loops for this code to work. here is my code.
main = [1 2 3 4 5 6;
7 8 9 10 11 12;
13 14 15 16 17 18;
19 20 21 22 23 24;
25 26 27 28 29 30;
31 32 33 34 35 36];
temp=0;
%temporary var for stride
tmpX=0;
tmpY=0;
for x=1:size(main,1)/3
for y=1:size(main,2)/3
for cx=1:3
for cy=1:3
%stride by 3
cy = cy+tmpY;
cx = cx+tmpX;
if main(cx,cy)>temp
temp = main(cx,cy)
end
end
end
if y == size(main,2)/3
tmpY=0;
tmpX=tmpX+3;
else
tmpY=tmpY+3;
end
end
end
I'm using the matrix 'main' as a sample input for the pooling, the program should give a 2x2 matrix output of [15,18,33,36] but I'm getting [15,18,19,0] ad an error message that says 'Index in position 1 exceeds array bounds (must not exceed 6).'

Answers (1)

Image Analyst
Image Analyst on 28 Dec 2018
Just look at what the variables are. cx is 7 and main is only 6 wide.
By the way, matrices have the horizontal (column) index second, not first like you have it. So matrices are main(y, x) NOT main(x, y).

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