centwave-scanrange

May 22, 2012, 03:51:52 AM

Hi,
I got a problem with the centwave-scanrange. I want to select a range of data using the scantime, however, the centwave only have the scanrange function.

my question is how to get the scanrange. I found that the the scanrange (scan index) is not the scan number.

.@ env :<environment: 0x02fb58e0>
..@ tic : num [1:1377] 30161494 29720700 30073236 29816570 29062580 ...
..@ scantime : num [1:1377] 6.07 6.94 7.8 8.69 9.55 ...
..@ scanindex : int [1:1377] 0 1006 2005 2995 4035 5069 6038 7052 8087 9132 ...
..@ polarity : Factor w/ 3 levels "negative","positive",..: 2 2 2 2 2 2 2 2 2 2 ...
..@ acquisitionNum : int [1:1377] 1 7 13 19 25 31 37 43 49 55 ...
..@ profmethod : chr "bin"
..@ profparam : list()
..@ mzrange : num [1:2] 50 1500
..@ gradient : logi[0 , 0 ]
..@ msnScanindex : int(0)
..@ msnAcquisitionNum : int(0)
..@ msnPrecursorScan : int(0)
..@ msnLevel : int(0)
..@ msnRt : num(0)
..@ msnPrecursorMz : num(0)
..@ msnPrecursorIntensity: num(0)
..@ msnPrecursorCharge : num(0)
..@ msnCollisionEnergy : num(0)
..@ filepath : chr "QC8.mzXML"

Re: centwave-scanrange

Reply #1 – May 23, 2012, 05:08:07 PM

..@ scantime : num [1:1377]

Your scan range is 1 to 1377.
The scantime slot of the xcmsRaw object contains the scan time of each scan.