Description Arguments Details Value Methods See Also
Specify a subset of the profile mode matrix given a mass, time, or scan range. Allow flexible user entry for other functions.
object |
the |
mzrange |
single numeric mass or vector of masses |
rtrange |
single numeric time (in seconds) or vector of times |
scanrange |
single integer scan index or vector of indecies |
... |
arguments to other functions |
This function handles selection of mass/time subsets of the profile matrix for other functions. It allows the user to specify such subsets in a variety of flexible ways with minimal typing.
Because R does partial argument matching, mzrange
,
scanrange
, and rtrange
can be specified in short
form using m=
, s=
, and t=
, respectively. If
both a scanrange
and rtrange
are specified, then
the rtrange
specification takes precedence.
When specifying ranges, you may either enter a single number or
a numeric vector. If a single number is entered, then the closest
single scan or mass value is selected. If a vector is entered,
then the range is set to the range()
of the values entered.
That allows specification of ranges using shortened, slightly
non-standard syntax. For example, one could specify 400 to 500
seconds using any of the following: t=c(400,500)
,
t=c(500,400)
, or t=400:500
. Use of the sequence
operator (:
) can save several keystrokes when specifying
ranges. However, while the sequence operator works well for
specifying integer ranges, fractional ranges do not always work
as well.
A list with the folloing items:
mzrange |
numeric vector with start and end mass |
masslab |
textual label of mass range |
massidx |
integer vector of mass indecies |
scanrange |
integer vector with stat ane end scans |
scanlab |
textual label of scan range |
scanidx |
integer vector of scan range |
rtrange |
numeric vector of start and end times |
timelab |
textual label of time range |
profRange(object, mzrange = numeric(),
rtrange = numeric(), scanrange = numeric(),
...)
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