[R] apply( )

[Petr Klasterecky]

ifelse(((x < y) | (x > z)), 1, 0)

Note in particular the use of | instead of || for elementwise comparisons.

Petr

Greg Tarpinian napsal(a):
> 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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-- 
Petr Klasterecky
Dept. of Probability and Statistics
Charles University in Prague
Czech Republic