Re: [R] sample within a loop

lp@r-project.org Subject: Re: [R] sample within a loop Hi, you can try df1<-split(df,df$groups) lapply(df1, function(x) { x<-cbind(x,entry=0) sam <- sample(x$plotno,1) x$entry[which(x$plotno==sam)]<-"CONTROL" x$entry[which(!x$plotno==sam)]<-"TEST" x

[R] sample within a loop

Dear R users, My data frame has four "groups" namely A1, B2, C3, & D4. Each group has 12 rows (variable "plotno). I like to randomly sample one "plotno" within each "groups" variable and label it as "CONTROL" and label others as "TEST" in a new variable called "entry". I am tr

Re: [R] sample within a loop

org, Sweden | mashra...@yahoo.com From: "DIGHE, NILESH [AG/2362]" To: "r-help@r-project.org" Sent: Thursday, 17 March 2016, 18:18 Subject: [R] sample within a loop Dear R users, My data frame has four "groups" namely A1, B2,

Re: [R] sample within a loop

I would change strategies. Create a new variable, say, num.in.grp <- rep(1:12, 4) Then sample from 1:12, and add appropriate amounts so that they become row numbers within the four sets of 12 rows ctrls <- ssample(1:12, 4, replace=TRUE) + c(0,12,24,36) Now that we have four random row number