Removing duplicate coordinates in a GPS measurement logfile

Hi there,

I have a problem. I have these raw data GPS measurements. Sometimes I find that the measurement will show errors that are related to going back to a certain intial position. This creates hand fan like plots when I plot the measurement. Cleaning up this log files could start by stating that no duplicates of a specific coordinate can occur.

Now I'm faced with finding those duplicates and removing them. I have found the Unique function, but I can't seem to work out how to remove all the double or multiple entries. There are multiple files that contain thousands of coordinates per file. Being able to clean that up a bit would be very helpfull for the computation time. Can somebody help me out here?

I am looking for the following functionality

• Loading a file,
• loading the appropiate columsn (X,Y, Z),
• storing that in either a variable or seperate file,
• clearing memory of files data that is obsolete.
• repeat for new file

The data in the files looks a bit like the following example

Raw Variable Data

0 9 0

5 5 0

1 8 0

5 5 0

2 7 0

5 5 0

3 6 0

4 5 0

5 4 0

6 3 0

7 2 0

3 1 0

3 1 0

8 1 0

3 1 0

3 1 0

9 0 0

This is what I would like it to look like after clean up. (removing the coordinates 5 5 0 and 3 1 0

Clean Variable data

0 9 0

1 8 0

2 7 0

3 6 0

4 5 0

5 4 0

6 3 0

7 2 0

8 1 0

9 0 0

Up to now, I have the following code for working through the files.

clc 
clear all 
clear mex 
clc

files = dir('*.txt')
for i=1:9%length(files);
    eval(['load ' files(i).name ' -ascii'])
    variableName = whos;
    str=[variableName(i).name]
    disp(str)
    length=[variableName(i).size(1)];
    variable=eval(str);
    X=[variable(:,8)];
    Y=[variable(:,10)];
    A(:,1)=X;
    A(:,2)=Y;
%     [UniXY,Index]=unique(A,'rows');
% DupIndex=setdiff(1:size(A,1),Index);
% A(DupIndex,:)=[];
% X=A(:,1)';
% Y=A(:,2)';
% clear variable
end