Hello everyone, I am trying to use the following code: dat<-read.table(file="C:\\Documents.....txt") class2<-read.table(file="C:\\Documents.....txt") class1<-read.table(file="C:\\Documents .....txt") dat<-as.data.frame(dat) dimnames(dat)[[1]]<-paste("g",c(1:nrow(dat)),sep="") l<-c(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1) rbind(l,dat) dat<-as.matrix(dat) x<-dat[1:100,] wilcox.test<-function(x,s1,s2) { x1<-x[s1] x2<-x[s2] x1<-as.numeric(x1) x2<-as.numeric(x2) wilcox.out<-wilcox.test(x,y=NULL,exact=FALSE,mu=0,correct=TRUE,alternative="two.sided",paired=FALSE) out<-as.numeric(wilcox.out$statistic) return(out) } wilcox.test.run<-apply(x,1,wilcox.test,s1=x[1:27],s2=x[28:39]) wilcox.test.run[is.na(wilcox.test.run)]<-1 The error I get is that error in wilcox.test : unused arguments(y=Null,exact=FALSE,mu=0,correct=TRUE,alternative="two.sided,paired=FALSE) I get this error no matter if I use all the arguments available or as few arguments as possible. I do not know what I am doing wrong and would appreciate any suggestions. Thanks Paul
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