[Numpy-discussion] Appending a numpy array to existing text file

[LB]

If you just want to add your matrix to an existing ascii file, you can
open this file in append mode and give the file handle to
numpy.savetxt :

f_handle = file('my_file.dat', 'a')
savetxt(f_handle, my_matrix)
f_handle.close()

HTH

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LB