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Summing MS Intensity Values

Source: R/sumi.R
sumi.Rd

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.

Usage

sumi(x)

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.

See also

maxi()

Author

Johannes Rainer

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