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I need to write data in scientific notation in a .dat file. For example Export["1.dat", {123.}]. I want to get 1.23e2 in 1.dat. But if I use ScientificForm I can only get ScientificForm[{123.}].

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  • $\begingroup$ This can help you: mathematica.stackexchange.com/a/35375/280 $\endgroup$ – Alexey Popkov May 16 '18 at 2:00
  • $\begingroup$ Sorry But i don't think it works.Using his code my export is still 123 not 1.23e2, His method is mainly used to promote speed. $\endgroup$ – XinBae May 16 '18 at 3:10
  • $\begingroup$ You can replace FortranForm with ScientificForm or NumberForm (as in the answer by Carl Woll) in that solution in order to get the desired format. $\endgroup$ – Alexey Popkov May 16 '18 at 4:04
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Maybe you can use NumberForm and OutputForm as follows:

Export[
    "tst.dat",
    OutputForm @ NumberForm[
        N @ {Pi, E^3},
        NumberFormat -> (Row[{#1, "e", #3}]&),
        ExponentFunction -> Identity
    ]
];
Import["tst.dat", "String"]

"{3.14159e0, 2.00855e1}"

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  • $\begingroup$ Thanks ! it is the format i want.But it caused another problem. How can i remove the` {}` in "tst.dat"? $\endgroup$ – XinBae May 16 '18 at 6:34

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