Re: Export with append??
- To: mathgroup at smc.vnet.net
- Subject: [mg129491] Re: Export with append??
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Fri, 18 Jan 2013 00:50:12 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
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- References: <kd5hu2$jjp$1@smc.vnet.net> <20130117041653.995FF6882@smc.vnet.net>
But surely appending like that won't work for many export formats. E.g., I hesitate to think what it might do to a PDF export. On Jan 16, 2013, at 11:16 PM, Szabolcs <szhorvat at gmail.com> wrote: > Hello Maarten, > > In fact there is a simple way to make Export append rather than overwrite. Please see here: > > http://mathematica.stackexchange.com/a/2228/12 > > You just need to use a stream in place of the file name: > > file = OpenAppend["out.txt"] > > Export[file, data, "CSV"]; > WriteString[file, "\n"]; > > Close[file] > > On Wednesday, 16 January 2013 01:38:58 UTC-5, Maarten van der Burgt wrote: >> Dear Alexei, >> >> >> >> Thanks for your help. Hope the Wolfram folks are reading this as well. >> >> Something simple like this should really be an option in the function >> >> Export. >> >> >> >> Meanwhile I found back something similar for XLS files in my knowledge >> >> base: >> >> >> >> XLAppend[oldfile_, newfile_, newdata_] := Module[ >> >> >> >> {sheets, olddata, completedata}, >> >> >> >> sheets = Import[oldfile, "Sheets"]; >> >> >> >> olddata = {#, Import[oldfile, {"Sheets", #}]} & /@ sheets; >> >> >> >> completedata = Join[olddata, newdata]; >> >> >> >> Export[newfile, Rule @@@ completedata] >> >> >> >> ] >> >> >> >> >> >> >> >> Best regards, >> >> >> >> >> >> >> >> Maarten >> >> >> >> >> >> >> >> >> >> >> >> Maarten van der Burgt >> >> >> >> Product Engineering - ICOS Division >> >> >> >> ________________________________ >> >> >> >> KLA-Tencor | ICOS Division >> >> Tel: +32 16 398220 | Direct: +32 16 398263 | Fax: +32 16 400067 >> >> >> >> KLA-TENCOR (Belgium) - Haasrode Research Park 1112 - Esperantolaan 8 = - >> >> B-3001 Leuven - BELGIUM >> >> >> >> Mail: maarten.vanderburgt at kla-tencor.com >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> From: Alexei Boulbitch [mailto:Alexei.Boulbitch at iee.lu] >> >> Sent: maandag 14 januari 2013 10:22 >> >> Cc: Maarten van der Burgt >> >> Subject: Re: Export with append?? >> >> >> >> >> >> >> >> >> >> >> >> Hallo, >> >> >> >> >> >> >> >> 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 --- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 5 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305
- References:
- Re: Export with append??
- From: Szabolcs <szhorvat@gmail.com>
- Re: Export with append??