[R] apply()

[Ko-Kang@xtra.co.nz]

Hi,

I input this command on a data matrix:
 >   apply( traffic, 2, function(z){z-mean(z)})

and got the following error messages:
  Error in sum(..., na.rm = na.rm) : invalid "mode" of argument

Can anyone tell me what is wrong here?

Running R1.2.2 on Windows ME.

Cheers,

Kevin

-------------------------------------------------
Ko-Kang Kevin Wang
Statistical Analysis Division Leader
Software Developers' Klub
University of Auckland
New Zealand

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