Re: [R] Error in if-command

HI, Your second function works: fun2<-function(y){  if(y==2){  print("yes")}  else {print("no")}}  fun2(3) #[1] "no"  fun2(4) #[1] "no"  fun2(2) #[1] "yes" But, in the first case, it is a vector. So, you can use: fun3<-function(y){  numbers1<-c(4,5,9,11,17)  if(y %in% numbers1){  print("yes")}  

Re: [R] Error in if-command

HI, Try ifelse  fun1<-function(y){  ifelse(y==c(4,5,9,11,17),"yes","no")  } > fun1(9) #[1] "no"  "no"  "yes" "no"  "no" A.K. - Original Message - From: Dominic Roye To: r-help@r-project.org Cc: Sent: Sunday, August 12, 2012 6:12 AM Subject: [R] Error in if-command Hello everybody,

Re: [R] Error in if-command

Take a look at ?ifelse Cheers, Michael On Aug 12, 2012, at 3:12 AM, Dominic Roye wrote: > Hello everybody, > > I don't understand what I'm doing wrong. But it isn't possible that each > element of the if-condition is tested for each vector element? > > y <- c(1:20) >> y > [1] 1 2 3 4 5