preserve format when extracting from list in R -

i have loop stores in list 1 date , 1 value after computations. create two-column table (date,value) when extract values list can't preserve date format:

n <- 5  x <- factor(1:3,levels=1:3,labels=c('a','b','c')) dates <- as.date(c('2000-01-01','2001-01-01','2002-01-01'))  mylist <- list()  (i in 1:n) {    #some operations    mylist[[i]] <- list(sample(dates,1),as.numeric(sample(x,1)))  }  z <- do.call(cbind,mylist) 

you need change data structure 1 can hold different data types (i.e. data frame) , rbind them together:

for (i in 1:n) {    #some operations    mylist[[i]] <- data.frame(sample(dates,1),as.numeric(sample(x,1)))  }  z <- do.call(rbind,mylist) 

the problem in code cbind operation coerced list matrix (which default behavior of rbind/cbind) can hold 1 data type.