9
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Toy example:

First, create a Dataset:

data = Dataset[{<|"x" ->  1, "y" -> -2|>,
                <|"x" -> -3, "y" ->  4|>}]

Mathematica graphics

Next, export it as a TSV file:

Export["/tmp/data.tsv", data, "tsv"];

Finally, check output from the Unix command-line:

% cat /tmp/data.tsv
 x    y
 1    2
 3    4

Note that the minus signs are missing from the output!


I'm using Version 11.1.0.0 for Linux (64-bit).


NB: I have not looked into this problem systematically. In particular, I have not looked at other formats, other conditions that may lead to loss of data, other versions of Mathematica, other OSs, etc.

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  • 1
    $\begingroup$ Confirmed this behavior also on Mac OS ($Version=11.0.1 for Mac OS X x86 (64-bit) (September 21, 2016) ) $\endgroup$ – yohbs Jul 26 '17 at 21:11
7
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Yes, this looks like a bug, it also happens on Windows 11.1.1 and Linux 11.1.1, however, until this is fixed in the next version (which is certainly will be, right WRI?), you can do this simple workaround:

ExportString[#, "TSV"] &@
Map[Values]@
Normal@Dataset[{<|"x" -> 1, "y" -> -2|>, <|"x" -> -3, "y" -> 4|>}]
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  • 3
    $\begingroup$ This is already fixed in our internal development version and will be in the next release. $\endgroup$ – Itai Seggev Jul 27 '17 at 3:37

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