Hi R users,
I am trying to set the values of elements of one matrix based on the values
of elements of another matrix.
Say I have 2 matrices, y and z.
y = matrix(rnorm(35), ncol=5)
z = matrix(rep(0,35), ncol=5)
I want z[i,j] to take a value of y[i,j] when y[i,j] is greater than 0, and
zero otherwise.
I was able to do it using the following loop:
for(i in 1:7)
{
for(j in 1:5)
{
if(y[i,j]>0) {
z[i,j]=y[i,j]
} else {
z[i,j]=0}}
}
but since my dataset is very large, looping often crashes. Is there a more
elegant way I can achieve the same result?
Many thanks!!!
--
View this message in context:
http://r.789695.n4.nabble.com/Evaluating-matrices-without-using-loops-tp2155574p2155574.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
