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Re: comments in import files

  • To: mathgroup at
  • Subject: [mg74665] Re: comments in import files
  • From: "beheiger" <beheiger at>
  • Date: Fri, 30 Mar 2007 03:00:00 -0500 (EST)
  • References: <eudd45$sdc$> <eufr25$7rm$>

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"];

Works for me! Thanks,


"Szabolcs" <szhorvat at> schrieb im Newsbeitrag 
news:eufr25$7rm$1 at
> On Mar 28, 11:39 am, "beheiger" <beheiger at> wrote:
>> Hi,
>> I would like to know if Mathematica can handle comments in import files.
>> In particular, I would like to add lines of comments to 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 these comments in 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 the comments, 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 the comments, but it may be slow with large datasets.

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