Matlab issue in Ubuntu 12.04

I have just installed Ubuntu 12.04 and tried the following Matlab code

        sdirectory = '/home/user/Work/Hari';
        tifffiles = dir([sdirectory '/*.jpg']);       
        for k = 1:length(tifffiles)
            filename = [sdirectory '/' tifffiles(k).name];
            I = imread(filename);
        end

Here, I am trying to do some operations on the .jpg images stored in the folder /home/user/Work/Hari. But, when executing this program. its giving no output. But, not giving any error.

When tried to see the pixel values in I, its giving the error - ??? Undefined function or variable 'I'.

What will be the problem ? How can I solve this issue ?

[Walter Roberson]

Please recheck sdirectory. Should it be /home/user/Hari/Work or perhaps /home/users/Hari/Work ?