Re: Problem with Import[] and math.exe

*To*: mathgroup at smc.vnet.net*Subject*: [mg98286] Re: Problem with Import[] and math.exe*From*: David Bailey <dave at removedbailey.co.uk>*Date*: Fri, 3 Apr 2009 20:15:28 -0500 (EST)*References*: <gr4jf8$a5a$1@smc.vnet.net>

andreas.kohlmajer at gmx.de wrote: > Hi all! > > I spend several hours with a simple issue I don't understand. I would > like to create a daily task on WinXP; I have already shortened my > complex package to a very simple one, but it still doesn't work: > > This code works fine in the regular front end: > > In[1]:= > ps=$PathnameSeparator; > data=Import[FileNameJoin[{"C:",ps,"Temp",ps,"data.TSV"}]]; > Length[data] > Export[FileNameJoin[{"C:",ps,"Temp",ps,"output.txt"}],data] > Pause[2]; > Quit[]; > > Out[3]= 1996 > Out[4]= "C:\\Temp\\output.txt" > > It also works fine using math.exe or mathkernel.exe by typing in > everything manually. I have created a package c:\temp\test.m > containing the code above. > > I can start math.exe and load the package and output.txt is created. > The same happens with mathkernel.exe: > > Mathematica 7.0 for Microsoft Windows (32-bit) > Copyright 1988-2009 Wolfram Research, Inc. > > In[1]:= Get["c:\\temp\\test.m"] > > > However, if I try > > "C:\Program Files\Wolfram Research\Mathematica\7.0\math.exe" -initfile > c:\temp\test.m > or > "C:\Program Files\Wolfram Research\Mathematica\7.0\mathkernel.exe" - > initfile c:\temp\test.m > > (which are my batch commands for the daily task) , I get an error > message: > > Mathematica 7.0 for Microsoft Windows (32-bit) > Copyright 1988-2009 Wolfram Research, Inc. > > Import::infer: Cannot infer format of file data.TSV. > > Output.txt now contains Null. I also tried to give explicit importing > information ("Table", "TSV", "FieldSeparator", encoding information > etc.), but it doesn't work. > > I don't understand this. Do I need to load other .m-files (e.g. some > init.m) too? > The rest of my complex package (including SQL communication, > statistical calculations, graphics generation) works fine, but I > cannot load a simple tsv-file. > > My system: > $Version = "7.0 for Microsoft Windows (32-bit) (February 18, 2009)" > $OperatingSystem = "Windows" > > Are there any good references for notebook automation and evaluation > using scheduled tasks under Windows? Thanks for any help! > I encountered a bug with Import (confirmed by someone at WRI) under these conditions using version 6.0. My current method of starting MathKernel is to use a small C program (which has an icon that can sit on the desktop) which starts the kernel via MathLink, and passes it a Get command on a file of Mathematica commands. There are several ways to start Math - such as piping the input, or using one of the other command line options, and I don't remember exactly what worked and what didn't (there seemed to be various gotcha's), but I ended up with the above solution, which works well. David Bailey http://www.dbaileyconsultancy.co.uk