Iulia Puscas, you can use open and read from a text file using the Open/Create/Replace file and Read From Text File VIs. From there you need to convert the string that is output from the Read Text File to and array by using the Spreadsheet string to Array function. Note that your data is space delimited rather than tab delimited, so you need to wire in a space constant.
I've attached a VI that will do this. Let me know if I need to save it for an older version of LabVIEW.