sumi sums mass spectrometry intensity values, e.g. from a spectrum or
chromatogram. In contrast to the base R sum() function this function
returns NA_real_ if all intensity values are NA or if length(x) is 0.
Arguments
- x
numeric with intensity values to be summed up. Will be coerced
to numeric using as.double.
Value
numeric(1) representing the sum of values in x. Always returns
a numeric (double) even if x is an integer.
Examples
x <- c(3.2, 34.4, 1.3, NA)
sumi(x)
#> [1] 38.9
## Compared to base R sum:
sum(x)
#> [1] NA
sum(x, na.rm = TRUE)
#> [1] 38.9
sum(numeric(), na.rm = TRUE)
#> [1] 0
sumi(numeric())
#> [1] NA
sum(c(NA, NA), na.rm = TRUE)
#> [1] 0
sumi(c(NA, NA))
#> [1] NA
