Description Usage Value Examples
Creates a function based on a previous experimental analysis of a Q-Exactive at +/- 0.5 isolation window efficiency. See http://pubs.acs.org/doi/abs/10.1021/acs.analchem.6b04358
The function that is created will output a value between 0 to 1 based on the position between the minOff and maxOff params
NOTE: The resulting function will work for values greater that 0.5 and less than -0.5.
This is because (on our instrument tested at least) when using a window of +/- 0.5, the isolation is NOT confined to the +/-0.5 Da window. Resulting in ions from outside the window being isolated. For this reason the function can normalise values outside of the the +/- 1 Da range. Please see above paper figure 3 for more details.
normalisation function for +/- 0.5 range for Q-Exactive
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iwNormFun <- iwNormQE.5() pm <- data.frame(mz=c(99.5, 99.9, 100, 100.1, 100.5),i=c(1000, 1000, 1000, 1000, 1000)) mzmax = 100.5 mzmin = 99.5 middle <- mzmax-(mzmax-mzmin)/2 adjustmz = pm$mz-middle # normalise the intensities pm$normi = pm$i*iwNormFun(adjustmz)
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