[R] apply()

[Chuck Cleland]

Ko-Kang at xtra.co.nz wrote:
> 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

Could be that traffic is not a proper matrix.  Are all of the columns of traffic
numeric?  And why not try this, which should be equivalent and handles NA's
better.

apply(traffic, 2, scale, scale=F)

HTH,

Chuck
 
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 Chuck Cleland                                 
 Institute for the Study of Child Development  
 UMDNJ--Robert Wood Johnson Medical School     
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