I am trying to clean up my code for cleaning missing data. I have a dataset with 6 columns and the code works if I were to do them individually like this:
mammographic_masses <- mammographic_masses %>%
mutate(birad = replace(birad, birad== "na", NA)) %>%
mutate(birad = replace(birad, birad== "N/A", NA))
But when I try to do it in a for loop like this:
for (i in ncol(mammographic_masses)){
print(class(mammographic_masses[[i]]))
mammographic_masses <- mammographic_masses %>%
mutate(mammographic_masses[[,i]] = replace(mammographic_masses[[,i]], mammographic_masses[[,i]] == "na", NA)) %>%
mutate(mammographic_masses[[,i]] = replace(mammographic_masses[[,i]], mammographic_masses[[,i]] == "N/A", NA))
}
I get an error:
Error: unexpected '=' in:
" mammographic_masses <- mammographic_masses %>%
mutate(mammographic_masses[[,i]] ="
> mutate(mammographic_masses[[,i]] = replace(mammographic_masses[[,i]], mammographic_masses[[,i]] == "N/A", NA))
Error: unexpected '=' in " mutate(mammographic_masses[[,i]] ="
> }
Error: unexpected '}' in "}"
I also was reading up on other ways such as apply etc. but i cant figure a way to loop it per column
Instead of looping, use mutate_all
.
library(dplyr)
mammographic_masses %>%
mutate_all(function(x) {is.na(x) <- x %in% c("na", "N/A"); x})
# V1 V2 V3 V4
#1 d b <NA> c
#2 d b <NA> <NA>
#3 <NA> <NA> d b
#4 a <NA> <NA> b
#5 a b d <NA>
#6 d c b c
#7 b b d <NA>
#8 <NA> <NA> <NA> d
#9 a d d <NA>
#10 <NA> b d <NA>
Test data creation code
set.seed(2020)
n <- 10
mammographic_masses <- replicate(4, sample(c(letters[1:4], "na", "N/A"), n, TRUE))
mammographic_masses <- as.data.frame(mammographic_masses)
To provide the "new" dplyr
preferred across
as well as str_replace_all
(good point @Gregor)
library(dplyr)
library(stringr)
mammographic_masses %>%
mutate(across(everything(),
~ str_replace_all(., c("na" = NA_character_, "N/A" = NA_character_))))
#> V1 V2 V3 V4
#> 1 d b <NA> c
#> 2 d b <NA> <NA>
#> 3 <NA> <NA> d b
#> 4 a <NA> <NA> b
#> 5 a b d <NA>
#> 6 d c b c
#> 7 b b d <NA>
#> 8 <NA> <NA> <NA> d
#> 9 a d d <NA>
#> 10 <NA> b d <NA>
Same data as Rui
set.seed(2020)
n <- 10
mammographic_masses <- replicate(4, sample(c(letters[1:4], "na", "N/A"), n, TRUE))
mammographic_masses <- as.data.frame(mammographic_masses)
We can also use na_if
library(dplyr)
mammographic_masses %>%
mutate(across(everything(), ~ na_if(na_if(., "na"), "N/A")))
set.seed(2020)
n <- 10
mammographic_masses <- replicate(4, sample(c(letters[1:4], "na", "N/A"), n, TRUE))
mammographic_masses <- as.data.frame(mammographic_masses)
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