目的：創(chuàng)建循環(huán)變量名"xxx.pdf" ，其中xxx是基因名

eg:gene=c("gene1","gene2",......)

class(gene)? ? --->character

參考：paste0("A", 1:5)

引申：paste0(gene[i],".pdf")

實(shí)現(xiàn)：

for (i in 1:length(gene)){

? # i=1

p=FeaturePlot(scRNA, features = gene[i])? ##scRNA為單細(xì)胞對(duì)象

ggsave(p,filename = paste0(gene[i],".pdf"))

}