How to apply hsize of 3x3 square matrix into gaussian filter ?

I saw a few examples of gaussian filter. H = FSPECIAL('gaussian',N,SIGMA). I found that N is always a 1-by-2 vector specifying the number of rows and columns in H. My question is, I have 3x3 matrix square of N, i.e. [1 2 3; 4 5 6; 7 8 9], How do I put this 3x3 matrix square of N into FSPECIAL('gaussian',N,Sigma. I have tried to infer N as [1 2 3; 4 5 6; 7 8 9] and the errors are listed as below: _ _??? Error using ==> iptcheckinput Function FSPECIAL expected its second input, N, to be integer-valued.

Error in ==> fspecial>ParseInputs at 347 iptcheckinput(p2,{'double'},...

Error in ==> fspecial at 97 [type, p2, p3] = ParseInputs(varargin{:});__

Answer 1

[Wayne King]

Why are you trying to do that? fspecial() gives you the Gaussian filter, then you use that to filter your matrix.

   H = fspecial('gaussian',[3 3],0.5);
   A = [1 2 3; 4 5 6; 7 8 9];
   out = imfilter(A,H,'replicate');