3
$\begingroup$

I have some problems converting data which I imported from a txt-file into proper Mathematica expressions. After importing my data looks like

sample = {"{3", "\"string1\"", 45, "\"string2\"", 8.32, " {2013", 8, 1, 0, 6, " 19}", "0.}"}

Now I would like to transform it into

converted = {3, "string1", 45, "string2", 8.32`, {2013, 8, 1, 0, 6, 19}, 0.}

I imported the file using Import[file.txt,"Data"]

$\endgroup$
  • 2
    $\begingroup$ If you provide a sample from file.txt we might be able to make Import do a part of the job for you. $\endgroup$ – C. E. Feb 21 '14 at 10:34
  • $\begingroup$ Try to import as "Package", not "Data" if you have a list written using Mathematica syntax. $\endgroup$ – Szabolcs Feb 21 '14 at 18:21
7
$\begingroup$

You can Map with this:

ToExpression[StringJoin @@ Riffle[ToString /@ sample, ","]]
{3, "string1", 45, "string2", 8.32`, {2013, 8, 1, 0, 6, 19}, 0.`} 
| improve this answer | |
$\endgroup$
  • $\begingroup$ Thanks for the elegant solution, solved my problem entirely $\endgroup$ – RMMA Feb 21 '14 at 11:19
  • $\begingroup$ @Kuba, Nice solution, but I wander: If this oddly shaped "sample" was imported from a text file, Wouldn't probably be better to parse the data correctly in the first instance, instead of correcting it afterwards? $\endgroup$ – rhermans Feb 21 '14 at 14:38
  • $\begingroup$ @rhermans That's what Pickett and Szabolcs are suggesting, I agree but OP has not responded to the comments. $\endgroup$ – Kuba Feb 21 '14 at 21:56
4
$\begingroup$

Another solution without the use of Riffle :

ToExpression@StringReplace[ToString[sample], {"\\" -> "", "{{" -> "{", "}}" -> "}"}]
| improve this answer | |
$\endgroup$
  • 1
    $\begingroup$ Congratulations on your fanatic badge :) (temporary message) $\endgroup$ – Jacob Akkerboom Feb 25 '14 at 17:28
  • 1
    $\begingroup$ Thank you!(permanent message):-P $\endgroup$ – tchronis Feb 25 '14 at 18:05

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.