MS Data Analysis

Description Usage Arguments Details Value Author(s) See Also Examples

Subset an xcmsRaw object by scans. The returned xcmsRaw object contains values for all scans specified with argument i. Note that the scanrange slot of the returned xcmsRaw will be c(1, length(object@scantime)) and hence not range(i).

1 2	## S4 method for signature 'xcmsRaw,logicalOrNumeric,missing,missing' x[i, j, drop]

`x`	The `xcmsRaw` object that should be sub-setted.
`i`	Integer or logical vector specifying the scans/spectra to which `x` should be sub-setted.
`j`	Not supported.
`drop`	Not supported.

Only subsetting by scan index in increasing order or by a logical vector are supported. If not ordered, argument i is sorted automatically. Indices which are larger than the total number of scans are discarded.

The sub-setted xcmsRaw object.

Johannes Rainer

split.xcmsRaw

## Load a test file
file <- system.file('cdf/KO/ko15.CDF', package = "faahKO")
xraw <- xcmsRaw(file)
## The number of scans/spectra:
length(xraw@scantime)

## Subset the object to scans with a scan time from 3500 to 4000.
xsub <- xraw[xraw@scantime >= 3500 & xraw@scantime <= 4000]
range(xsub@scantime)
## The number of scans:
length(xsub@scantime)
## The number of values of the subset:
length(xsub@env$mz)