ms_bin
Purpose
Bins Mass Spectral data into user-defined bins.
Synopsis
dso = ms_bin(data)
dso = ms_bin(data, options)
Description
Often raw Mass Spec data is output in its original profile
format (e.g., 14.5, 14.5, 14.6,...) and one requires "unit" mass
resolution (e.g., 14, 15, 16,...) in order to reduce the size of the data and
or analyze the data properly. In its default form the MS_BIN function will bin
at unit resolution and return the data in a DataSet Object. Using the two
optional parameters (resolution and round_off_point) the function can be
adjusted to meet different requirements.
INPUTS:
data : a cell array with the
data. Each cell will correspond to a row in the resulting dataset 'dso' and
should contain nx2 numeric array of "xy" MS data: the first column
contains the mass numbers, the second column contains the counts (intensities).
The number of rows in the cells can be different.
OUTPUTS:
dso : dataset object
Options
resolution : optional, defines the
resolution. The default value is 1.
round_off_point : optional. Normally the round-off
point is in the middle of the bin. For unit resolution it would be 0.5:
everything below 0.5 will be rounded down, everything higher than 0.5 will be
rounded up. In case the peak is asymmetrical other points are used, e.g. 0.65.
The round off for the array m with the mass numbers is then:
round(m+0.5-round_off_point); The asymmetric round-off is also valid for
resolution lower than 1: the round_off_point is the relative position in the
bin.
See Also
ms_bindemo
