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append to a file

  • To: mathgroup at
  • Subject: [mg46801] append to a file
  • From: Francois Coppex <coppexfrancois at>
  • Date: Tue, 9 Mar 2004 04:30:44 -0500 (EST)
  • Sender: owner-wri-mathgroup at

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

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)?

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