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--- day1_exercise3 [2017/12/13 18:12] – created hyjeong
+++ day1_exercise3 [2021/03/17 13:09] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+  #1
+  dat=read.csv(file='Ex_data.csv',stringsAsFactors=F)
+  #2
+  head(dat)
+  #3
+  dim(dat)
+  #4
+  write.table(dat[,1],file='gene_name.txt',quote=F,sep='')
+  #5
+  x=dat[,2:10]
+  head(x)
+  write.table(x,file='sub_data.txt',quote = F,sep = '\t')
+  #6
+  y=dat[nchar(dat[,1])>7,]
+  dim(y)
+  write.table(y,file='sub_data2.csv',sep=',')
+  #7
+  sum(is.na(dat))
+  #8
+  which(is.na(dat))
+  #9
+  which(is.na(dat),arr.ind = T)
+  #10
+  index=which(is.na(dat),T)
+  dat[index]=10
+  sum(is.na(dat))
+  dat[index]