I have a data frame frugivore.abundance.S1 where some columns are factors and others are numbers.For example these are my independent variables and "density" is my dependent variable. census<-c(1:70)sites<-c(1:5)birds<-c(1:45)

I want to select the data where sites is 1 and birds are 1,23,24 or 29
So I write:fa1<-frugivore.abundance.S1attach(fa1)(abund.frug.RN1<-fa1[sites==1 & birds==c(1,23,24,29),])
This code doesn't print all the data it should for some reason. It seems to not print rows where "density" has the same value as another row with the same criteria.
i.e. if in the original data we have the following then only rows 1 and 3 will be printed, not all of them:
census   sites   birds   density1                 1         1         0.0032                 1         1         0.0033                 1         1         0.001
Can anyone help me out with this please?
RegardsMariki
 		 	   		  
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