How to use H=lpfilter​('gaussian​',M,N,sigm​a); filter in frequency domain

I used the following codes : [M,N]=size(f); H=lpfilter('gaussian',M,N,sig); where f is the image and sig=10. I have downloaded the lpfilter.m but it gives the following error.

Undefined function 'dftuv' for input arguments of type 'double'.

Error in lpfilter (line 10) [U,V] = dftuv(M,N);

Answer 1

[ali ibrahim]

miss function dftuv:

 function [U, V] = dftuv(M, N)
%DFTUV Computes meshgrid frequency matrices.
%   [U, V] = DFTUV(M, N) computes meshgrid frequency matrices U and
%   V.  U and V are useful for computing frequency-domain filter
%   functions that can be used with DFTFILT.  U and V are both
%   M-by-N.

% Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins % Digital Image Processing Using MATLAB, Prentice-Hall, 2004 % $Revision: 1.3 $ $Date: 2003/04/16 22:30:34 $

% Set up range of variables. u = 0:(M - 1); v = 0:(N - 1);

% Compute the indices for use in meshgrid. idx = find(u > M/2); u(idx) = u(idx) - M; idy = find(v > N/2); v(idy) = v(idy) - N;

% Compute the meshgrid arrays. [V, U] = meshgrid(v, u);