grapes-plus-na-grapes: %+na%

In ie2misc: Irucka Embry's Miscellaneous USGS Functions

%+na%

Description

This function "defines a dyadic operator that will behave differently than the "+" operator with regards to missing values". (Quote by 42- in Source 1 below). In this case, add x and y so that NA is ignored when x is a number and x = NA when x = 0.

Usage

x %+na% y

Arguments

x	numeric vector that does not contain any NA values
y	numeric vector which contains at least one NA value

Value

numeric vector resulting from the sum of x and y

Source

1. Using ':=' in data.table to sum the values of two columns in R, ignoring NAs - Stack Overflow answered by 42- on Oct 28 2012. See https://stackoverflow.com/questions/13106645/using-in-data-table-to-sum-the-values-of-two-columns-in-r-ignoring-nas.

2. R - merge unequal regular (15 min intervals) and irregular time series within 10 minutes - Stack Overflow asked by iembry on Jan 12 2015 and edited by iembry on Feb 2 2015. See https://stackoverflow.com/questions/27911643/r-merge-unequal-regular-15-min-intervals-and-irregular-time-series-within-10.

3. r - How to not run an example using roxygen2? - Stack Overflow answered and edited by samkart on Jul 9 2017. (Also see the additional comments in response to the answer.) See https://stackoverflow.com/questions/12038160/how-to-not-run-an-example-using-roxygen2.

4. devtools - Issues in R package after CRAN asked to replace dontrun by dontrun - Stack Overflow answered by Hong Ooi on Sep 1 2020. (Also see the additional comments in response to the answer.) See https://stackoverflow.com/questions/63693563/issues-in-r-package-after-cran-asked-to-replace-dontrun-by-dontrun.

Examples

library("ie2misc")

a <- 1:10
b <- c(98:106, NA)

a %+na% b


## Not run: 
# See Source 3 and Source 4
# Note that if the vector with the NA value(s) is first, then an error
# message will be displayed as now there are checks for both x and y.

a <- 1:10
b <- c(98:106, NA)

try(b %+na% a)

## End(Not run)


a1 <- 1:12
b1 <- c(98:106, rep(NA, 3))

a1 %+na% b1


# using a matrix of the numeric vectors a and b
mat1 <- matrix(data = c(a, b), nrow = length(b), ncol = 2, byrow = FALSE,
        dimnames = list(c(rep("", length(b))), c("a", "b")))
mat1[, 1] %+na% mat1[, 2]


# using a data.frame of the numeric vectors a and b
df1 <- data.frame(a, b)
df1[, 1] %+na% df1[, 2]


library("data.table")

# using a data.table of the numeric vectors a and b

a <- 1:10
b <- c(98:106, NA)

df2 <- data.table(a, b)
df2[, 1, with = FALSE][[1]] %+na% df2[, 2, with = FALSE][[1]]

ie2misc documentation built on Sept. 20, 2023, 9:08 a.m.