# HG changeset patch # User jcb-mpl # Date 1652357601 0 # Node ID 50d9f45f2182f1b1d9e9baaf97b28a8ee6960e3c # Parent 4e9b2d0c010bb6948a287d2879836ff6ee212e78 Deleted selected files diff -r 4e9b2d0c010b -r 50d9f45f2182 2018_07_first_eics.xml --- a/2018_07_first_eics.xml Thu May 12 12:13:15 2022 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,169 +0,0 @@ - - - - - - scilab - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -**Author** Jean-Claude Boulet (INRAE). - - ---------------------------------------------------- - -========================================== -EXTRACTION OF EICS FROM A CENTROID MS DATA -========================================== - ------------ -Description ------------ - -The HRMS analysis of a samples yields a MS data. - -From a centroid MS data, a matrix of (RT x m/z) is extracted. - -Each column of this matrix is an EIC = Extracted Ion Chromatogram, i.e. the signals of a given m/z value along the retention times. - ------- -Inputs ------- - -**MS-centroid** - -It is an HDF5-Scilab structure obtained by the previous processings and containing the fields: - -- resbary.time: the retention times; - -- resbary.mzdata: the mass spectra associated to the RTs. - - - ----------- -Parameters ----------- - -Three thresholds have to be determined. - - -**Threshold for the m/z values** - -The difference between two m/z values is compared to the threshold; if lower, the m/z values are considered as the same and merged; if higher the m/z values are considered as different. - -Default value: 0.0024. - - -**Threshold for the signals** - -The EICs whose global signal is under this threshold are dropped from the EIC matrix. - -Default value: 30000. - - -**Threshold for Durbin-Watson** - -Durbin-Watson values can range between 0 and 2. - -EICs with a DW value higher than the threshold are considered as noise and therefore dropped. - -Default value: 1. - - - ------ -Oupts ------ - -**EIC-individual matrix** - -A matrix of signal intensities obtained from a single MS: - -- rows are the retention times; - -- columns are the m/z values determined by the processing. - -The file is a .dat HDF5-Scilab format. - - - - - - - - - - - - - - -