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MathGroup Archive 2007

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ReadList -- file size limits?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82811] ReadList -- file size limits?
  • From: david.sedarsky at forbrf.lth.se
  • Date: Wed, 31 Oct 2007 06:19:23 -0500 (EST)
  • Organization: Lund University, Sweden

Is ReadList limited in some way regarding the amount of data it can read 
in?

I have a large data file (~450M text file) and I'm doing something like 
the following:

stream = OpenRead[fullname]; (*open file for reading*)
header = ReadList[stream, String, 1](*read header strings*)
header = Flatten[StringSplit[header]];
data = ReadList[stream, Number, 8(1=D710^6)]);(*read 8 columns of number 
data*)
Close[stream];

Apparently Readlist doesn't read in the whole file.  The code shown above
runs fine, but data has max length of: 3278320, which corresponds to 
409790 lines of the data file.  Can anyone clue me in as to why this is? 
Is this a suitable approach for reading numbers from a very large ascii 
file?

thanks,

DS


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