Please can someone help me out with this code?

This code is giving me error message (FUNCTION keyword use is invalid here, this might cause later message about END).

 df=findobj('tag', 'edit3 '); 
sdf=get( df,'string'); 
fg=['c:/users/gabs/documents/matlab/Segmented' sdf]; 
vv =imread(fg); 
if ndims(vv)==3 
    I=rgb2gray(vv); 
else 
    I=vv; 
end 
vv=I; 
N = normalise(vv,O,l); % normalise to have zero mean, unit std dev 
yu=['Originallmage:', sdf]; 
po=['c:/users/Deji/documents/matlab/Normalized ',sdf]; 
imwrite(N,po ); 
%subplot(1 ,2,1), imshow(I,'initialmagnification' ,215), title(yu); 
imshow(N),title(strcat(po )); 
% This function normalizes the image to desired mean of 0 and variance of 1 
  function gb = normalise(image,desiremean,desirevar)

if ~(margin == 1 || margin == 3) 
error('No of arguments must be 1 or 3'); 
end 
if margin == 1 % Normalisc 0 - 1 
  ifndims(image) ~= 3;   % Assume colour i.mage 
else % Normalise to desired mean and variance 
  if ndims(image) == 3   % colour image? 
error('cannot normalise colour image to desired mean and variance'); 
end 
if ~isa(dsafimage,'double') 
image = double(image); 
end 
image = image - mean(image(:)); 
image = image/std(image(:));   % Zero mean, unit std dev 
gb = desiremean + image*sqrt(desirevar); 
end

Answer 1

[Matt Fig]

Where is this code located? If you have it in a script or at the command line, that would explain why you get that error.

Answer 2

[Azzi Abdelmalek]

save this function

   function gb = normalise(image,desiremean,desirevar)

 if ~(margin == 1 || margin == 3) 
error('No of arguments must be 1 or 3'); 
end 
if margin == 1 % Normalisc 0 - 1 
  ifndims(image) ~= 3;   % Assume colour i.mage 
else % Normalise to desired mean and variance 
  if ndims(image) == 3   % colour image? 
error('cannot normalise colour image to desired mean and variance'); 
end 
if ~isa(dsafimage,'double') 
image = double(image); 
end 
image = image - mean(image(:)); 
image = image/std(image(:));   % Zero mean, unit std dev 
gb = desiremean + image*sqrt(desirevar); 
end

then run this part of your code

df=findobj('tag', 'edit3 '); 
sdf=get( df,'string'); 
fg=['c:/users/gabs/documents/matlab/Segmented' sdf]; 
vv =imread(fg); 
if ndims(vv)==3 
  I=rgb2gray(vv); 
else 
  I=vv; 
end 
vv=I; 
N = normalise(vv,O,l); % normalise to have zero mean, unit std dev 
yu=['Originallmage:', sdf]; 
po=['c:/users/Deji/documents/matlab/Normalized ',sdf]; 
imwrite(N,po ); 
%subplot(1 ,2,1), imshow(I,'initialmagnification' ,215), title(yu); 
imshow(N),title(strcat(po ));

[Walter Roberson]

The function should be saved in the file normalise.m