[R] 'Apply' giving me errors

[Uwe Ligges]

On 21.10.2011 02:09, kickout wrote:
> So i have a simple function:
>
> bmass=function(y){
> weight=y$WT*y$MSTR
> return(bio)
> }
>
> And want to apply to a whole bunch of rows in my data.frame:
>
> final1=apply(final,1,yldbu)
>
>
> BUT...recieve the following error:
> "Error in y$WT : $ operator is invalid for atomic vectors"
>
>
> However when i try:
>> final[1,]$WT*final[1,]$MSTR
> [1] 156.3
>
>
> It gives me the correct answer....what is apply not liking in my code?

Since apply passes the rows as vectors into your function, not as a 
data.frame of 1 row.

I woder why you need apply() at all, since
  final$WT * final$MSTR
should do.

Uwe Ligges









>
> Thanks
>
>
>
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