Output argument not assigned during call

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,'same')+S;
    L=exp(-Alpha_L)* L+V_L * conv2(Y,M,'same');
    U=F.*(1+Beta* L);
    Y=double(U>T);
    T=exp(-Alpha_T)*T+V_T*Y;
end

end

Script

I=imread('d:\segleaf\i1.jpg');
[I1]=PCNN(I);

Answer 1

[Geoff Hayes]

Kiruba - look at your function signature

 function [S1]= PCNN(S)

The output parameter is S1 yet nowhere in your code is this variable declared. You will need to determine which of the variable in your for loop corresponds to S1 and initialize S1 to this variable.

Answer 2

[the cyclist]

The output variable S1 is never assigned in the function.