[R] simplify if statement in R ?

[Jim Maas]

I found a form of the if statement that works but it is very long.  I'm 
attempting to check the value of of two different variables to see if 
they evaluate to either of two different values, which will result in a 
division by 0 in the final equation.  This first if statement works for me
_______

  if ((x0.trial01 == 0.0)||(x0.trial01 == npt01)||(x1.trial01 == 
0.0)||(x1.trial01 == npt01))
         {
             x0.trial01.in <- x0.trial01 + 0.5
             x1.trial01.in <- x1.trial01 + 0.5
             npt01.in <- npt01 + 1.0
         }
         else
         {
             x0.trial01.in <- x0.trial01
             x1.trial01.in <- x1.trial01
             npt01.in <- npt01
         }
__________

I've tried
if ( ( x0.trial01 || x1.trial01) == ( 0.0 || npt01) )
     ......


but it doesn't seem to work correctly.  Is there a simpler way to check 
two variables for two different valuables?

Thanks

J

----
Jim Maas