wrMisc (version 1.2.3)

XYToDiffPpm: Express difference as ppm

Description

XYToDiffPpm transforms offset (pariwise-difference) between 'x' & 'y' to ppm (as normalized difference ppm, parts per million, ie (x-y)/y ). This type of expressiong differences is used eg in mass-spectrometry.

Usage

XYToDiffPpm(x, y, nSign = NULL, silent = FALSE, callFrom = NULL)

Arguments

x

(numeric) typically for measured variable

y

(numeric) typically for theoretical/expected value (vector must be of same length as 'x')

nSign

(integer) number of significant digits in output

silent

(logical) suppres messages

callFrom

(character) allow easier tracking of message(s) produced

Value

numeric vector of (ratio-) ppm values

See Also

ratioToPpm for classical ppm

Examples

# NOT RUN {
set.seed(2017); aa <- runif(10,50,900)
cbind(x=aa,y=aa+1e-3,ppm=XYToDiffPpm(aa,aa+1e-3,nSign=4)) 
# }