Re: Writing and reading a comma delimited or tab delimited file one record at a time
- To: mathgroup at smc.vnet.net
- Subject: [mg69116] Re: [mg68255] Writing and reading a comma delimited or tab delimited file one record at a time
- From: Igor Antonio <igora at wolf-ram.com>
- Date: Wed, 30 Aug 2006 06:34:03 -0400 (EDT)
- References: <200607310745.DAA26735@smc.vnet.net>
- Reply-to: igora at wolf-ram.com
- Sender: owner-wri-mathgroup at wolfram.com
Richard Palmer wrote:
> I need to be able to write a large file with delimited fields with a
> new line symbol separating records. Since the files can be very
> large, I can't create or read them all at once and work with them in
> memory. It would be nice to create small sample files I can look at
> in EXCEL (I'm on a MAC). The files I need to create consist of 5
> string valued fields and a positive real number. I suspect this is
> simple, but I can not see a simple way to do it from the
> documentation: The goal is to take
> alfa code 1
> alfa code 5
> alfa code1, alfa code 2, ... , alfa code t, amount \nl
> (the comma is a ',' or some other separator) in writing the file and,
> correspondingly, be able to read the file back
> I guess I'm a little surprised there are no ImportLine or ExportLine
> commands corresponding to the Import and Export commands. It's always
> nice to be able to work with all the data. However, sometimes there
> is too much data and we need to be able to work with summaries.
Mathematica has "lower-level" functions that let you read/write to a
file. Take a look at the documentation:
Built-In functions > Input and Output > File Output.
Take a look at Write and WriteString, specifically.
Igor C. Antonio
Wolfram Research, Inc.
To email me personally, remove the dash.
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