For 'VEC' you may not need to do anything -- in a lot of circumstances it will just work.
For 'VECH' you can write a function using the 'lower.tri' function. But it seems to me that the assumption behind your question is that a simple function that someone else has written is going to be better than a simple function that you write. Not true (barring bugs). R is egalitarian -- your functions have the same standing as "official" functions. A lot of times it is faster to write a function of your own rather than search out someone else's even if you know such functions exist. Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User") megh wrote:
Can anyone please tell whether there is any R function to act as "VEC" and "VECH" operator on Matrix? Yes of course, I can write a user-defined-function for that or else, I can put dim(mat) <- NULL. However I am looking for some R function. Your help will be highly appreciated. Regards,
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