Finally, I would like to be able to save the two lists as plain text files (no commas, no brackets). I tried writeFile+Show, but this saves the lists exactly as printed on screen (whereas I simply would like a text file showing a column of numbers when opened by your favorite editor). Many thanks
One list as a column:
writeFile "bar" $ unlines (map show list)
A list as a space-separated sequence of numbers on one line:
writeFile "bar" $ unwords (map show list)
Hi Daniel, And thanks for your help. Your solution works, but it looks like that on my machine (an up-to-date desktop computer with plenty of ram) file writing is unusually slow [it looks like it takes more than 10 minutes to write a text file of a few megabites which comes from a long list]. I wonder if there is any way to speed up the process or it is an inherent limitation of lists (or I am making some mistake). Cheers Lorenzo P.S.: the list is a list of lists, hence I use this function save_vector_flat filename list = writeFile filename $ unlines (map show $ concat list)