append to a file

*To*: mathgroup at smc.vnet.net*Subject*: [mg46801] append to a file*From*: Francois Coppex <coppexfrancois at yahoo.fr>*Date*: Tue, 9 Mar 2004 04:30:44 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I would like to append to a text file some values in a row, each time the cell is evaluated. For instance, I'd like to create a text file containing the values: a11 a12 a13 a14 a15 a16 a21 a22 a23 a24 a25 a26 a31 a32 a33 a34 a35 a36 a41 a42 a43 a44 a45 a46 where aij denotes the j-th value of the i-th run of the evaluation. The problem is that I wasn't able to figure out how to append the lines to the file. I'm using the command Export["file.txt", {ai1, ai2, ai3, ai4, ai5, ai6}, "Table"]; which obviously overvrites the file each time, so that I only get ai1 ai2 ai3 ai4 ai5 ai6 for all i. Is there a simple way to append the data to the file (goal: include in a DO loop)?