Manual Deconvolution without using deconv

Can someone help to write the Deconvolution-formel as a matlab code.

I know that y(n) = x(n)*h(n), so the length of y = (length of x + length of h) -1

I just tried something but the length of the vectors are not right so i dont get the right results.

y=input('Enter y: ')

h=input('Enter h: ')

m=length(y);

n=length(h);

Y=[y,zeros(1,m+n+1)];

H=[h,zeros(1,m)];

for i=n+m;

X(i)=0;

for j=1:n+m-1

if(i-j+1>0)

X(i)=X(i)+((Y(i)-X(j)*H(i-j+1))/H(1));

else

end

end

X

end