MATLAB: I’m getting the error as matrix dimensions must agree at line no 20

Question

function [S1]= PCNN(S)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
Alpha_F=0.1;
Alpha_L=1.0;
Alpha_T=1.0;
V_F=0.5;
V_L=0.2;
V_T=20.0;
Beta=0.1;
Num=100;
W=[0.5 1 0.5;1 0 1; 0.5 1 0.5];
M=[0.5 1 0.5;1 0 1; 0.5 1 0.5];
F=zeros(size(S));
L=F;
Y=F;
U=F;
T=ones(size(S));
S=im2double(S);
for n=1:Num
    F=exp(-Alpha_F)*F + V_F .* conv2(Y,W)+S;
    L=exp(-Alpha_L)* L+V_L * conv2(Y,M);
    U=F.*(1+Beta* L);
    Y=double(U>T);
T=exp(-Alpha_T)*T+V_T*Y;
end
end

Answer 1

That seems unlikely. Line 20 is the "for" loop.

You probably want to use the 'same' option for conv2()