求助在用splus时出现问题，问题如下：

b12<-read.table('F:/b12.xls',row.names=NULL,header=T)
> Warning messages:
> 1: file "F:/b12.xls": incomplete last line in: count.fields(file = file, sep = sep, skip = skip)
> 2: file "F:/b12.xls": incomplete last line in: scanDefault(file, what, n, sep = ..1, skip = ..2)
> Problem in read.table: No data to interpret as logical value: if(length(as.is) < fields) as.is <- rep(as.is
> , length = fields)
> Use traceback() to see the call stack