You request makes no sense. uigetfile does not read files. It prompts you to select a file and simply returns the name of the selected file. You can use csvread, dlmread even xlsread or some other low level function to read that file.
Even better, nowadays you have readtable that can read both excel files and csv files and is easier to use than xlsread.
You should read the documentation of the functions you use if you're not sure what they do.
