data.table

Question

में सूची के स्तंभ से स्तंभ बनाएं मैं निम्न कार्य पूरे करने को समझ नहीं सकता, data.table

set.seed(123); N=1e5 
DT = data.table(x=rnorm(N), y=sample(c('a','b','c'),N,T)) 
probs = seq(.1,1,.1); newCols <- paste("q",100*probs,sep=""); 

DT2 <- DT[ ,list(Q=list(quantile(x,probs=probs))),by=y] 
DT2 
# y                   Q 
#1: b -1.2817037351734,-0.840293441466144,-0.525195748246148,-0.259574774974136, 
#2: c -1.26975023312311,-0.832359658553173,-0.513320691339448,-0.247863323660894, 
#3: a -1.28189935066568,-0.838918942382995,-0.522409189372727,-0.257356179072232, 

#Here I want to create 10 columns from Q called q10, q20... 
DT2[ , newCols:=Q] #can't make this work because it is evaluated in the wrong environment I guess 

Answer 1

के साथ सूची का एक स्तंभ से स्तंभ की एक गतिशील संख्या crating इस प्रयास करें:

DT2 <- DT[ , as.list(quantile(x,probs=probs)),by=y] 
setnames(DT2, c("y", paste0("q", seq(10, 100, by=10)))) 

# y  q10  q20  q30  q40   q50  q60  q70  q80 
# 1: b -1.281704 -0.8402934 -0.5251957 -0.2595748 -0.001625739 0.2526686 0.5251940 0.8379979 
# 2: c -1.269750 -0.8323597 -0.5133207 -0.2478633 0.003413041 0.2598378 0.5353759 0.8477539 
# 3: a -1.281899 -0.8389189 -0.5224092 -0.2573562 0.001186281 0.2542550 0.5244238 0.8401411 
#   q90  q100 
# 1: 1.284773 3.856234 
# 2: 1.283465 4.322815 
# 3: 1.273615 3.921410