res = read.table("ttest_expression.tsv",sep=",",header = TRUE)
rownames(res)=res[,colnames(res)[1]]

res[rownames(res),colnames(res)[2:length(colnames(res))]]

expr_data = http://www.mamicode.com/try(read.table(exp_file, header=T, quote="",row.names=1, sep=‘\t‘,check.names=F,as.is=TRUE, encoding="utf-8"))

R 培训之 Table