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?
Thank you.
-Dhiren
matrix operation
2 messages · Dhiren DSouza, Achim Zeileis
On Fri, 07 Oct 2005 18:01:41 -0400 Dhiren DSouza wrote:
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
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html