Importdata problem

Hello, I´d like to do a GUI thtat shows two differents lines. Each line is represented throw a file.dat.

First, I look for the library, and I have:

uigetdir --> library='C:\Users\Jhon\Desktop\';

handles.Library=library;

After, I must choose a file:

if hObject==handles.one

file='Data\file1.dat';

elseif hObject==handles.two

file='Data\file2.dat'

end

handles.File=file;

Then

Library=handles.Library

File=handles.File

Direction=strcat(Library,'\',File)

a=importdata(Direction)

m=a.data;

axes(handles.axes1);

plot(m(:,1),m(:,2),'bo-')

But I have a problem:

Direction=

'C:\Users\Jhon\Desktop\Data\file1.dat'

and importdata don´t works.

If I write: Direction='C:\Users\Jhon\Desktop\Data\file1.dat', matlab will show:

Direction= C:\Users\Jhon\Desktop\Data\file1.dat --> (there aren´t '')

and importdata works.

What can I do?

[Oleg Komarov]

Please format the code: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup