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Maximum MS Intensity Value

Source: R/maxi.R
maxi.Rd

maxi determines the maximum or mass spectrometry intensity values, e.g. from a spectrum or chromatogram. In contrast to the base R max() function this function returns NA_real_ if all intensity values are NA or if length(x) is 0 (the base R max function returns -Inf in these cases).

Usage

maxi(x)

Arguments

x

numeric with intensity values from which the maximum should be reported. Will be coerced to numeric.

Value

numeric(1) representing the maximum of values in x. Returns always a numeric (double) even if x is an integer.

See also

sumi()

Author

Johannes Rainer, Sebastian Gibb

Examples


x <- c(3.2, 34.4, 1.3, NA)
maxi(x)
#> [1] 34.4

## Compared to base R max:
max(x)
#> [1] NA
max(x, na.rm = TRUE)
#> [1] 34.4

max(numeric(), na.rm = TRUE)
#> Warning: no non-missing arguments to max; returning -Inf
#> [1] -Inf
maxi(numeric())
#> [1] NA

max(c(NA, NA), na.rm = TRUE)
#> Warning: no non-missing arguments to max; returning -Inf
#> [1] -Inf
maxi(c(NA, NA))
#> [1] NA