I have a raw eeg signal in .edf format. I want to perform signal analysis on that. For that I need to have it as .txt or.xls or .dat formats. Also I used 'edfread' function to read it into matlab. But I got it as a very large matrix like of the order 51x556596. This is becoming very difficult for Matlab to handle. So far I have done the analysis of EEG data in text file format. So how can I convert the signals as text files.Now what should I to make my problem simple?