[R] apply( )

[jim holtman]

You don't need apply.  Just do

foo$result <- ifelse((foo$x < foo$y) | (foo$x > foo$z), 1, 0)

On 5/10/07, Greg Tarpinian <sasprog474 at yahoo.com> wrote:
> I have a question that must have a simple answer (but eludes me).
> I need a row-by-row logical comparison across three numeric variables
> in
> a data frame: foo$x, foo$y, foo$z.  The logic is
>
>   if( x < y || x > z ) 1 else 0
>
> for a particular row.
>
> It is simple and very inefficient to use for(i in 1:length(foo$x)){ }
> loops.  How can I accomplish this using sappy( ) / lapply( ) / apply( )
> or some other more efficient method?
>
> Thank you in advance,
>
>    Greg
>
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>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?