In R, use a function apply() inside of lapply that is working over a list of data frames -

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i using function from thread, want run on every data.frame in list. can't seem set indexing correctly, , after reading this thought maybe needed leave function outside of original lapply, didn't improve anything.

my 2 data frames nas turned list:

df1 <- data.frame(   = c(1, 2, 3, na),   b = c(1, 2, na, na),   c = c(1, na, na, na),   e = c(5, 6, 7, 8) )  df2 <- data.frame(   = c(1, 2, 3, na),   b = c(1, 2, na, na),   c = c(1, na, na, na),   e = c(5, 6, 7, 8) )  mylist <- list(df1, df2)

my function inside of lapply:

dd <- lapply(seq_along(mylist), function(i){          countna <- function(mylist[[i]]) apply(mylist[[i]], margin = 1, fun = function(x) length(x[is.na(x)]))          df_mos <- subset(mylist[[i]], select = c("a", "b", "c"))           na_count <- countna(df_mos)           x = mylist[[i]][na_count < 2,]           x = x[, c("e")] # give me value of e            x # return x          })

for expect following:

> dd [[1]]    e 1  5 2  6  [[2]]    e 1  5 2  6

r gives me error beginning bracket (and i've tried using 1 bracket instead of two, same thing occurs):

> dd <- lapply(seq_along(mylist), function(i){ +          +         countna <- function(mylist[i]) apply(mylist[i], margin = 1, fun = function(x) length(x[is.na(x)])) error: unexpected '[' in: "                 countna <- function(mylist[" >          >         df_mos <- subset(mylist[i], select = c("a", "b", "c")) error in subset(mylist[i], select = c("a", "b", "c")) :    object 'i' not found >          >          na_count <- countna(df_mos) error: not find function "countna" >           >          x = mylist[i][na_count < 2,] error: object 'i' not found >           >          x = x[, c("e")] # give me value of e  error: object 'x' not found >           >          x # return x  error: object 'x' not found >         }) error: unexpected '}' in "        }"

try modifying countna function this:

countna <- function(list_entry) apply(list_entry, margin = 1, fun = function(x) length(x[is.na(x)]))

as is, taking specific subsetted list argument, whereas function should take general argument, in case list. how list being isolated in order pass function handled elsewhere.


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