Convert ratio to ppm
ratioToPpm transforms ratio 'x' to ppm (parts per million).
If 'y' not given (or different length as 'x'), then 'x' is assumed as ratio otherise rations are constructed as x/y is used lateron.
Does additional checking : negative values not expected - will be made absolute !
ratioToPpm(x, y = NULL, nSign = NULL, silent = FALSE, callFrom = NULL)
x |
(numeric) main input |
y |
(numeric) optional value to construct ratios (x/y). If NULL (or different length as 'x'), then 'x' will be considered as ratio. |
nSign |
(numeric) number of significan digits |
silent |
(logical) suppres messages |
callFrom |
(character) allow easier tracking of message(s) produced |
numeric vector of ppm values
XYToDiffPpm for ppm of difference as used in mass spectrometrie
set.seed(2017); aa <- c(1.000001,0.999999,1+rnorm(10,0,0.001)) cbind(x=aa,ppm=ratioToPpm(aa,nSign=4))
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.