On 16.09.2012 12:41, SirRon wrote:
Hello,
I'm working with a dataset that has 2 columns and 1000 entries. Column 1 has
either value 0 or 1, column 2 has values between 0 and 10. I would like to
count how often Column 1 has the value 1, while Column 2 has a value greater
5.
This is my attempt, which works but doesn't seem to be very efficient,
especially when testing different values or columns.
count=0
for (i in 1:1000) { if(dataset[i,2]>5 && ind[i,1]==1) { count=count+1}}
You probably want
count <- sum(dataset[,2]>5 & ind[,1]==1)
Uwe Ligges
I'm looking for a more efficient/elegant way to do this!
Thanks!
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