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jnew
2003 Jun 02
1
data.frame building
...a loop. I know a while
back Prof. Ripley has suggested to construct a data frame of the right size
outside the loop and fill it within the loop. unfortunately, it is taken so
long (this is on P4 2.4 G 489M RAM). I am wondering if there was any other
way that is faster to do this job. I also do not jnow why it is faster to
construct columns in a data.frame than it is to do rows. i.e. I had to
construct 719 columns and it does not take any time to do so (each) however
if I say data[i,]<-data2[j,] it takes so long versus
data$temp<-data$a==data$b for example.
any help is greatly appreciated...