tobiasko
commented
2 years ago Dear @papanlipotype,
the S/N values are never stored in the raw file. They need to be calculated. This is for instance done by the plot method for rawrrSpectrum objects in case SN = TRUE:
plot.rawrrSpectrum <- function(x, relative = TRUE, centroid = FALSE, SN = FALSE,
legend = TRUE, diagnostic = FALSE, ...){
stopifnot(is.rawrrSpectrum(x))
if (centroid) {
stopifnot(x$centroidStream)
if (SN) {
plot(x = x$centroid.mZ, y = x$centroid.intensity/x$noise,
type = "h",
xlim = x$massRange,
xlab = "Centroid m/z",
ylab = "Centroid Signal/Noise",
frame.plot = FALSE, ...
)Currently the plot function only supports this for centroided data, although it has meanwhile become clear that the noise attribute is also available for (reduced) profile mode data.
But you could easily write a function that combines data retrieval and S/N calculation.
Hope this helps, Tobi
papanlipotype
Linda24bc
cpanse
Dear all, is there a way of accessing the S/N values from a readSpectrum-Object? I cant seem to find the info in the list. Thanks