Modify and recreate a list of data.frame in R

Question

I have a list of data.frame s called m (see HERE ). Column r in these data.frames is all NA .

But later on, I have computed some of these r s and stored them as a list called L .

I'm wondering how to achieve the following?:

(1) If any list entry in L (ie, L[[1]] , L[[2]] , ...), starts with a number BUT right after it is NA , replace NA with that number.

(2) Put back all new r s (stored in L ) in column r , in the original list of data.frames m .

D <- read.csv("https://raw.githubusercontent.com/izeh/m/master/g.csv", h = T) ## Data


m <- split(D, D$study.name) ;  m[[1]] <- NULL  ## original list of data.frame    
                                               ## To be finally recreated.


 L <- list(Bit.KnoA = rep(NA, 8), Bit.KnoB = rep(NA, 12), ChandlerA = c(.5, .5), 
Mubarak = c(.6, NA, .5, NA, .5, NA, .8, NA, .5,NA,.9,NA), SheenA = rep(NA, 6),
Shin.Ellis = rep(NA, 6), Sun = rep(NA, 6), Trus.Hsu = rep(NA, 2))


lapply(L, transform, r = zoo::na.locf0(r)) ## To achieve (1), but Not working !


###### NOW, put back L in the new list of data.frame like `m` above? ######

Answer 1

If the intention is to replace the 'r' column in the list of data.frame in 'm' with the corresponding 'L' list of vectors applied with na.locf0 , then

library(zoo)
m1 <- Map(function(x, y) transform(x, r = na.locf0(y)), m, L)