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import and export list: input and output do not match

Posted 10 years ago
3 Replies
2 Total Likes
Hi All

I am trying to export and then import a list; I woud like to obtain exactly the same list that I exported. I do this:

initial = {{{2013, 1, 2}, 41}, {{2013, 1, 3}, 42}};
initial // TableForm
Export["out.txt", initial, "List"];
final = Import["out.txt", "List"]
final // TableForm
and I get that "final" is different from "initial", see the attached pdf. I tried all possible combinations of "List" and "Table" and nothing works.
I use Mathematica 9 on Mac OSX 10.9

Thanks for any help

POSTED BY: luca bardill
3 Replies
Posted 10 years ago
Thanks a lot to both!

I actually had tried before the solution suggested by Bill Simpson but forgot the equal sign in the
expression, so it didn't work. Now is all fine.
POSTED BY: luca bardill
Note that for your example the Import is returning a list of Strings rather than the actual list elements that you are desiring. (The explicit String characters are suppressed in Mathematica output by default.) Thus using the following will give you your original  
final = ToExpression /@ Import["out.txt", "List"]
POSTED BY: David Reiss
Posted 10 years ago
In[1]:= initial = {{{2013, 1, 2}, 41}, {{2013, 1, 3}, 42}};
initial >> "out.txt";
final = << "out.txt";
initial == final

Out[4]= True
POSTED BY: Bill Simpson
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