I have a problem with the export of a simulated matrix (nrow=1000, ncol=492). I want to obtain a .txt file with fixed format data (five character for example). 
I've tried to use the instructions: options(digits=5) followed by write.table(...), but the .txt file reports always the data with different lenght, whereas the matrix in R gives right result (i.e. the elements have the same lenght).

Could you help me?

Thanks

Andrea Toreti
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