matrix operation

Hello:

I have a matrix 'dat' with 2 columns.

I have the following code:

for (i in 1:nrows(dat))
{
  if (dat[i,1] < dat[i,2])
    {
      dat[i,2]<-0
    }

   else
   {
     dat[i,2]<-1
   }

Is there a way to accomplish this without the for loop?
For this setting
  dat[,2] <- as.numeric(dat[,1] >= dat[,2])
seems to work.

For more complicated tasks look at ifelse().

hth,
Z
Thank you.

-Dhiren

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matrix operation

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