[R] ifelse statement with two vectors of different length

[arun]

Hi,
Please show a reproducible example.

countrydiff <- c("Albania", "Algeria", "Belarus", "Canada", "Germany")
long_df <- data.frame(country_name = c("Algeria", "Guyana", "Hungary", "Algeria", "Canada", "Iran", "Iran", "Norway","Uruguay", "Zimbabwe") )
 ifelse(long_df$country_name %in% countrydiff,1,0)
# [1] 1 0 0 1 1 0 0 0 0 0
#or
1*(long_df$country_name %in% countrydiff)
# [1] 1 0 0 1 1 0 0 0 0 0
A.K.




Dear list-members, 

I have the following problem: I have a vector (countrydiff) with
 length 72 and another vector (long_df$country_name) which is about 
12000 long. Basically what I want to do is to if the factor level (or 
string name) in long_df$country_name appears on the countrydiff, then 
long_df$povdat should be equal to 1, if it does not appear on the 
countrydiff vector then long_df$povdat should be equal to zero. I have 
tried different combinations and read some. The following code should in
 my mind do it, but it doesn’t: 

long_df$povdat<-ifelse(long_df$country_name == countrydiff, 1, 0) 

long_df$povdat<-ifelse(long_df$country_name %in% countrydiff, 1, 0) 

Additional information: the factor vector countrydiff contains 
unique country names (Albania, Zimbabwe etc.), whereas 
long_df$country_name also contains country names albeit not unique since
 it is in longform. The unique names that appear in long_df$country_name
 is around 200. 


Any suggestions? 
Thanks in advance. 

Best 
Adel