[R] error message

[wangwallace]

I was running a sampling syntax based on a data frame (ago) of 160 rows and
25 columns. Below are the column names:

> names(ago)
 [1] "SubID"  "AGR1"   "AGR2"   "AGR3"   "AGR4"   "AGR5"   "AGR6"   "AGR7"  
"AGR8"  
[10] "AGR9"   "AGR10"  "WAGR1"  "WAGR2"  "WAGR3"  "WAGR4"  "WAGR5"  "WAGR6" 
"WAGR7" 
[19] "WAGR8"  "WAGR9"  "WAGR10" "ocbi"   "ocbo"   "cwbi"   "cwbo"  

> dim(ago)
[1] 160  25

Here below is the syntax:

> crossed1<-function(df){          
+ s1<-df[sample(nrow(df),16,replace=F),]
+ s2<-t(apply(s1[,2:11],1,sample,10))
+ s2<-data.frame(s2)
+ s3<-df[-s1$SubID,] 
+ ind<-t(replicate(nrow(s3),sample(10))) 
+ s4<-matrix(nrow=nrow(s3),ncol=10)
+ rownames(s4)<-rownames(s3)
+ s4<-data.frame(s4) 
+ for(i in seq(nrow(s3))){
+ s4[i,1]<-s3[i,1+ind[i,1]]
+ s4[i,2:10]<-s3[i,11+ind[i,2:10]]
+ }
+ colnames(s2)<-colnames(s4)
+ rbind(s2,s4)[order(as.numeric(rownames(rbind(s2,s4)))),]
+ }
> result1<-vector("list",1000)
> for(i in 1:1000)result1[[i]]<-crossed1(ago)

These syntaxes worked out perfectly. I successfully drew 1000 random
samples.
I applied the syntax above to another data set called agr, which basically
has the same column names:

> names(agr)
 [1] "SubID"  "AGR1"   "AGR2"   "AGR3"   "AGR4"   "AGR5"   "AGR6"   "AGR7"  
"AGR8"  
[10] "AGR9"   "AGR10"  "WAGR1"  "WAGR2"  "WAGR3"  "WAGR4"  "WAGR5"  "WAGR6" 
"WAGR7" 
[19] "WAGR8"  "WAGR9"  "WAGR10" "ocbi"   "ocbo"   "cwbi"   "cwbo"  

agr and ago are basically the same except that agr has more rows than ago:

> dim(agr)
[1] 300  25

here below is the same syntax I've used for agr:

> crossed1<-function(df){          
+ s1<-df[sample(nrow(df),30,replace=F),] # note I have changed 16 to 30
+ s2<-t(apply(s1[,2:11],1,sample,10))
+ s2<-data.frame(s2)
+ s3<-df[-s1$SubID,] 
+ ind<-t(replicate(nrow(s3),sample(10))) 
+ s4<-matrix(nrow=nrow(s3),ncol=10)
+ rownames(s4)<-rownames(s3)
+ s4<-data.frame(s4) 
+ for(i in seq(nrow(s3))){
+ s4[i,1]<-s3[i,1+ind[i,1]]
+ s4[i,2:10]<-s3[i,11+ind[i,2:10]]
+ }
+ colnames(s2)<-colnames(s4)
+ rbind(s2,s4)[order(as.numeric(rownames(rbind(s2,s4)))),]
+ }
> result1<-vector("list",1000)
> for(i in 1:1000)result1[[i]]<-crossed1(agr)
Error in xj[i] : only 0's may be mixed with negative subscripts

However, I got an error message shown above. It is kinda weird. Could
anybody please explain what I've did wrong? Many thanks in advance!! :)
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