Code functions challenges
Quick notes about short R code and functions things that usually I don’t do and I tend to forget.
Change specific values in all columns for NA’s
A data frame with -9999
values in many columns that need to be replace
with NA
’s values:
# libraries
library(dplyr)
##
## Attaching package: 'dplyr'
## The following objects are masked from 'package:terra':
##
## intersect, union
## The following objects are masked from 'package:stats':
##
## filter, lag
## The following objects are masked from 'package:base':
##
## intersect, setdiff, setequal, union
# Test data frame
test <- tribble(~a, ~b, ~c,
"a", 2, -9999,
"b", 3, 5,
"c", -9999, 6,
"d", -9999, -9999)
# Solution
test %>%
mutate_all(~na_if(., -9999))
## # A tibble: 4 × 3
## a b c
## <chr> <dbl> <dbl>
## 1 a 2 NA
## 2 b 3 5
## 3 c NA 6
## 4 d NA NA