Import[filename,"CSV"] is so slooooooooow!
- To: mathgroup at smc.vnet.net
- Subject: [mg45920] Import[filename,"CSV"] is so slooooooooow!
- From: "1.156" <rob at pi-overe.com>
- Date: Thu, 29 Jan 2004 05:36:46 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
I'm getting data in CSV files to analyze. With the new ver. 4.2 I can
get these data in nicely using
data = Import["filename", "CSV"]
but it takes 30 seconds to get in a 100kB file. And I've got to do some
much longer files.
On the other hand, if I change all the comma delimiters to spaces, I can
get the data in using
inFile = OpenRead["filename"];
y = ReadList[inFile, Number, RecordLists -> True];
This pulls in the same 100kB file in a second or so. But, doing this
comma to space conversion is truly slow (using Word).
So, can someone out there enlighten me with a suggestion on how to
either speed up Import or get ReadList to handle comma delimiters?
Thanks and Regards, Rob
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