Conversion to cell from double is not possible.

g = {};
for k=1:4
    g(k) = {fspecial('gaussian',[2 2],k)};  
end
dx = {}; dy = {}; h1=[-1 0 1];h2=[1 0 -1];
for k=1:4
    dx(k) = imfilter(g{k},h1);
    dy(k) = imfilter(g{k},h2);
end

It gives me the error : Conversion to cell from double is not possible.

Answer 1

[Adam Danz]

    dx{k} = imfilter(g{k},h1);
    dy{k} = imfilter(g{k},h2);
%     ^ ^ Use curley brackets

or

    dx(k) = {imfilter(g{k},h1)};
    dy(k) = {imfilter(g{k},h2)};
%           ^  wrap in a cell ^

[valerio auricchio]

thanks a lott

[Adam Danz]

Glad I could help.