I'm using Mathematica to process some grades which are saved via Export[]. However, if I have real versions of integers, the exported numbers don't have a trailing 0. This lack of a trailing 0 messes up the program I am importing the csv file into. Ugh.

   Export[ "test.csv", {1.0, 0.0}]

You'll see that the output is


Can anyone give me an easy fix for this? The data I'm exporting is a mixture of strings (some of which are already in double quotes) and numbers.

  • $\begingroup$ Export["test.csv", NumberForm[{{1., 2.}}, {3, 1}]] $\endgroup$
    – george2079
    Commented Apr 3, 2018 at 20:13
  • $\begingroup$ Removed the Bugs tag, since this behaviour is expected; it's how Mathematica outputs floating-point numbers which happen to be integer. $\endgroup$ Commented Apr 3, 2018 at 20:24
  • 1
    $\begingroup$ "bugs" might apply to the program that needs trailing zeros to read it !! $\endgroup$
    – george2079
    Commented Apr 3, 2018 at 20:41
  • $\begingroup$ I agree with @george2079 but I would also argue it also applies to mathematica. The numbers in the example above are not integers. $\endgroup$ Commented Apr 3, 2018 at 20:49
  • $\begingroup$ @george2079 this output is not correct. I don't want any brackets in my output. $\endgroup$ Commented Apr 3, 2018 at 21:02

1 Answer 1


forgot we need to do a string conversion as well:

     Map[ToString[NumberForm[#, {20, 1}]] &, #, {-1}]] &@{{1., 2.}, {3, 4}}


enter image description here

note that this also rounds to a single decimal place. Additionally this breaks when mathematica wants to use scientific notation for large numbers.

  • 1
    $\begingroup$ Thanks for the solution, I think this is an area where Mathematica is really bothersome. One should be able to output numbers in a sane manner without having two write extensive code. $\endgroup$ Commented Apr 3, 2018 at 21:47
  • $\begingroup$ The ToString[] can be omitted: ExportString[Map[NumberForm[#, {20, 1}] &, {{1., 2.}, {3, 4}}, {-1}], "CSV"] $\endgroup$ Commented Sep 26, 2018 at 8:44

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