Thread Subject:

??? In an assignment A(I) = B, the number of elements in B and I must be the same.

hello,,

i need help becoz something's wrong with my code,,

please help me,,

that error show that -->> ??? In an assignment A(I) = B, the number of elements in B and I must be the same.

Error in ==> w1(i)=w1(i)+dw1(i);

please help me,, this is my homework and i must collect it tomorrow,,

my Code

p1=[0 1 0 2];

p2=[0 1 0 2];

t=[1 1 1 0];

%Weight

w1=0;

w2=0;

b=1;

teta=0;

w1new=1;

%Iteration

for j=1:3

for i=1:5

%Calculate n

    n(i)=w1*p1(i)+w2*p2(i)+b;
%Calculate Output

 if n(i)>teta
   a(i)=1;
 else
   a(i)=0;
end

 %calculate error value
 error(i)= t(i) - a(i);
 dw1(i)=error(i)*p1(i);
 dw2(i)=error(i)*p2(i);
 db{i}=error(i);
 w1(i)=w1(i)+dw1(i);
 w2(i)=w2(i)+dw2(i);
 b(i)=b(i)+db{i};
end

end

disp(['P1 : ',num2str(p1)]);

i dont know what's wrong with my code,,,

please help me :(

"baby" wrote in message <jojdl2$mge$1@newscl01ah.mathworks.com>...
> hello,,
>
> i need help becoz something's wrong with my code,,
>
> please help me,,
>
> that error show that -->> ??? In an assignment A(I) = B, the number of elements in B and I must be the same.
>
> Error in ==> w1(i)=w1(i)+dw1(i);

Look closely at the error message. The number of elements on the left side of the equation are not the same as those on the right side of the equation. Matlab can't put the data on right side into the variable on the left side because the side or indexing is wrong. When I look at these two lines:

> w1=0;

...
> w1(i)=w1(i)+dw1(i);

I immediately see that w1(i) doesn't make sense. When i=2, MATLAB tries to evaluate w1(2), which won't exist. This problem is replicated for w2 and b as well.