Navigate an MSnExp object
Navigate an MSnExp object by moving to the next or previous
spectrum.
navMS(i, object, msLevel, nav = c("nextMS", "prevMS"), ...)
nextMS(...)
prevMS(...)i |
The name or index of the current spectrum |
object |
The |
msLevel |
The MS level of the next or previous spectrum. If missing (default), then the level of the current spectrum is used. |
nav |
One of |
... |
Additional parameters. Currently ignored. |
An object of class Spectrum1 or Spectrum2,
depending on the value of msLevel or NULL, of no
spectrum is found.
Laurent Gatto
f <- msdata::proteomics(full.names = TRUE, pattern = "MS3") x <- readMSData(f, centroided. = c(FALSE, TRUE, FALSE), mode = "onDisk") (sp <- which(msLevel(x) == 3)[2]) ## 2nd MS3 spectrum x[[sp]] ## curent MS3 MSnbase:::nextMS(sp, x) ## next MS3 MSnbase:::prevMS(sp, x) ## prev MS3 MSnbase:::prevMS(sp, x, 2L) ## prev MS2 MSnbase:::prevMS(sp, x, 1L) ## prev MS1
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