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MathGroup Archive 2002

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trying to pull numbers out of a string from a file...

  • To: mathgroup at
  • Subject: [mg36595] trying to pull numbers out of a string from a file...
  • From: "1.156" <rob at>
  • Date: Fri, 13 Sep 2002 01:14:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

I've got to extract some numbers from a file that are in lines of text. Since the line contents are not numbers, I presume I must pull the line out as a string.  Here I start by pulling out just one line:

inFile = OpenRead["197-tst.txt"]
y = ReadList[inFile, String, 1, RecordLists -> True]

This appears to pull in a line. Now I want to take characters 25 to 110 to get just the stuff I want:
y1=StringTake[y ,{25,110}];

Here's the output.  StringTake doesn't seem to work.

StringTake[{aEX-004   2002197 0 0 0 5935.80 5946.66  27.06 -1281.9   -229.    321.    317.    367.   -115.    126.    146.   -410.  -426.000000EF   75.}, {25, 110}]

It doesn't take loading another package as far
as I can tell from the help.  I'm thinking that it doesn't work because it's trying to work on a list
rather than a string. I've tried Flatten, and other stuff to try to get to just a string and not a list but
nothing has worked so far.  I'm a long way from getting to those numbers in there but heck, I
can't even get to the string.  Can anyone point me in the right direction?

Thanks, Rob

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