Re: Importing binary file is toooooo slow...
- To: mathgroup at smc.vnet.net
- Subject: [mg54198] Re: Importing binary file is toooooo slow...
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Sun, 13 Feb 2005 00:21:29 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 2/12/05 at 1:57 AM, rob at pi-overe.com (J. K. Smith) wrote: >I'm using v.22.214.171.124 -- >I am importing (wrong word?) binary data from a file: ><< Utilities`BinaryFiles` >y = ReadListBinary["filename", SignedInt16, >ByteOrder->LeastSignificantByteFirst]; >The file is only 34k bytes long but it takes 16 seconds to do it. >This isn't a slow machine so clearly I'm doing something wrong >again. I don't think you are doing something wrong. I also found the ReadListBinary in that package to be slow. >I would appreciate any suggestions on how to make this thing sizzle >as I feel sure it can. Right now I'm dead if I have to do a big >file. You might try using the routines in the Experimental context. When I was using version 4, I found these routines to be faster although still slow. Anohter approach might be to read the file in as bytes then combine pairs of bytes into integers. As I recall, the slowness of ReadListBinary seemed to be due to the conversion process. Ulitimately, you could upgrade to version 5.1 which now has a built in function BinaryReadList which does the job and doesn't have the slowness of ReadListBinary. -- To reply via email subtract one hundred and four