Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2013

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Export with append??

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129450] Re: Export with append??
  • From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
  • Date: Mon, 14 Jan 2013 23:30:25 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net

Hello,

With a command like

Export["myfile.dat", results, "List" ]

is there a way to append the results to an existing myfile.dat, rather
than creating or overwriting an existing file?

thanks for your help,

Maarten


Hi, Maarten,
A simple workaround is to import your file, append a new file to it and then - to export the combined list. Assume that your mathematica notebook entitled "trialImportExport.nb"  is situated in the same folder as the already existing list entitled "myfile.dat".
To be precise I generated the file myfile.dat with the list:
{25, 36, 49}
in it. Assume further that I want to append the list
{a,b,c}
to it. Then the code

lst1=Import[NotebookDirectory[]<>"myfile.dat"]//Flatten;
lst2={a,b,c};
lst3=Append[lst1,lst2]//Flatten;
Export[NotebookDirectory[]<>"myfileNew.dat",lst3]

Does the job. The output cell below:
D:\Documents and Settings\ABo\My Documents\Works\Mathematica_works\Examples\TrialFiles\myfileNew.dat

shows that the file has been successfully exported.
I intentionally gave the resulting file a new name, "myfileNew.dat", to check the result, but the old name can also be given to it.

Have fun, Alexei


Alexei BOULBITCH, Dr., habil.
IEE S.A.
ZAE Weiergewan,
11, rue Edmond Reuter,
L-5326 Contern, LUXEMBOURG

Office phone :  +352-2454-2566
Office fax:       +352-2454-3566
mobile phone:  +49 151 52 40 66 44

e-mail: alexei.boulbitch at iee.lu<mailto:alexei.boulbitch at iee.lu>


  • Prev by Date: Prime numbers and primality tests
  • Next by Date: Re: defining an unknown function
  • Previous by thread: Export with append??
  • Next by thread: Re: Export with append??