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...al variable in the final file indicating from which files the data come from. As I have many Excel files and their sizes are very big I should write a loop in R to do the work. I will be very happy if you guide and help me to write the codes. Thank you very much in advance. Kind regards, Amir Kasaeian Amir Kasaeian, PhD Student in Biostatistics, Dept. of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences (TUMS). P.B. : 14155-6446 Cell Phone: +98-912-2063511 E-mail: akasaeian@razi.tums.ac.ir             amir_kasaeian@yahoo.com   [[alternative HT...

...ike you do in your post. With the side effect that any other software package would be able to access, and get rid of Excel dependency. But if for some reason you need Excell, then the error message is clear, only file extensions xls and xlsx are allowed. Rui Barradas Em 18-09-2012 13:54, Amir Kasaeian escreveu: > > > > Hello, > Thank you for all your support and help. > It works though I have a new problem and I don?t know can I ask you my questions. > For example, I encountered the below message when I append 30 files each of size 1000 observations with about 100 variables...