create a sample matrix from the main matrix [duplicate]

Question

I want to create a sample matrix from the main one with the sam number of columns but less rows (50) I tried to use a series of loops but it didn't work:

n=nrow(data) camp <- sample(1:n,size=50,replace=TRUE) n<-length(camp) c<-ncol(data) for(i in 1:n){ t<-camp[i] for(k in 1:c){ campione[i,k]<-data[t,k]} }

you want data[camp,]

s.brunel
– s.brunel

2017-03-31 09:25:40 +00:00
Commented Mar 31, 2017 at 9:25 — s.brunel
– s.brunel, Commented Mar 31, 2017 at 9:25

xraynaud · Accepted Answer · 2017-03-31 09:27:40Z

You don't need to use loop. You just have to take random lines from your main matrix:

mat = matrix(runif(2000),ncol=20) sample_matrix = mat[sample(1:nrow(mat),50),]

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