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Date: Mon, 27 Oct 2008 10:56:13 -0500
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Confusing wrote:
> how to use xlswrite to get around the 256 column issue?

You cannot.

http://office.microsoft.com/en-us/excel/HA101375451033.aspx

  A Microsoft Office Excel worksheet contains 65,536 rows and 256 columns.
  You cannot increase the number of rows or columns beyond the maximum row and column limits.

http://support.microsoft.com/kb/264626

  MORE INFORMATION
  You cannot exceed the maximum limits of features in Excel. For example, you cannot
  increase the number of worksheet rows beyond 65,536. 

http://support.microsoft.com/kb/120596/en-us

  In Microsoft Excel 97 for Windows, Microsoft Excel 2000, Microsoft Excel 2002, 
  and Microsoft Office Excel 2003, text files that contain more than 65,536 rows
  cannot be opened in their entirety. You cannot open these files because these versions
  of Microsoft Excel are limited to 65,536 rows.

  Notes

  Versions of Excel earlier than Excel 97 have a limit of 16,384 rows.

  Versions of Excel later than Excel 2003 have a limit of 1,048,576 rows.


"Versions of Excel later than Excel 2003" includes only "Excel 2007" at the present
time. And Matlab's xlswrite() has not caught up to Excel 2007 format in your version.

> how to break down the data segments in matlab?

Do you really need binary Excel format? Or do you just need comma delimited format?
If you just need a comman delimited format, use dlmwrite()