Re: comments in import files
- To: mathgroup at smc.vnet.net
- Subject: [mg74958] Re: comments in import files
- From: "beheiger" <beheiger at hotmail.com>
- Date: Fri, 13 Apr 2007 01:55:32 -0400 (EDT)
- References: <eudd45$sdc$1@smc.vnet.net><eufr25$7rm$1@smc.vnet.net> <evhud0$33k$1@smc.vnet.net>
Thanks! Andi "Szabolcs" <szhorvat at gmail.com> schrieb im Newsbeitrag news:evhud0$33k$1 at smc.vnet.net... > > This is an old thread, but this might be useful for someone: > > I just figured out that you can Import[] from pipes directly, like > this: > Import["!grep -c ^# " <> filename, "Table"] > > Szabolcs > > http://documents.wolfram.com/mathematica/book/section-1.11.10 > > On Mar 30, 10:04 am, "beheiger" <beheiger at hotmail.com> wrote: >> Hi Szabolcs, >> >> I took up your approach in the following form: >> >> ImportTableNoComments[filename_] := Module[{tempfilename, res}, >> tempfilename = filename <> "~"; >> Run["grep", "-v", "^#", filename, ">", tempfilename]; >> res = Import[tempfilename, "Table"]; >> DeleteFile[tempfilename]; >> Return[res]; >> ]; >> >> Works for me! Thanks, >> >> Andy >> >> "Szabolcs" <szhorvat at gmail.com> schrieb im >> Newsbeitragnews:eufr25$7rm$1 at smc.vnet.net... >> >> > On Mar 28, 11:39 am, "beheiger" <beheiger at hotmail.com> wrote: >> >> Hi, >> >> >> I would like to know if Mathematica can handlecommentsin import files. >> >> In particular, I would like to add lines ofcommentsto an >> >> <emptyspace>-separated >> >> ASCII table (say, "results.dat") that I produced with other programs. >> >> However, >> >> I can't seem to find anything on how to write thesecommentsin such a >> >> way >> >> that >> >> Mathematica's function, used as >> >> >> Import["results.dat","Table"]; >> >> >> does not complain. Help is appreciated. >> >> >> Regards, Andy >> >> > If nobody else posts a better solution (I hope that someone will), you >> > can use the grep program to strip out thecomments, e.g. >> > readTable[filename_] := (Run["grep", "-v", "^#", filename, ">", "c:\ >> > \temp\\tmpfile"]; Import["tmpfile", "Table"]) >> >> > (This will remove lines starting with #.) >> >> > Of course you can also use Mathematica to read the file line by line >> > and strip out thecomments, but it may be slow with large datasets. > > >