/usr/share/pyshared/PyMca/SpecArithmetic.py is in pymca 4.5.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2004-2009 European Synchrotron Radiation Facility
#
# This file is part of the PyMCA X-ray Fluorescence Toolkit developed at
# the ESRF by the Beamline Instrumentation Software Support (BLISS) group.
#
# This toolkit is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# PyMCA is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# PyMCA; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307, USA.
#
# PyMCA follows the dual licensing model of Trolltech's Qt and Riverbank's PyQt
# and cannot be used as a free plugin for a non-free program.
#
# Please contact the ESRF industrial unit (industry@esrf.fr) if this license
# is a problem for you.
#############################################################################*/
#!/usr/bin/env python
"""
This module implements several mathematical functions:
- peak search
- center of mass search
- fwhm search
WARNING : array are Numeric.array objects.
"""
import numpy.oldnumeric as Numeric
def search_peak(xdata,ydata):
"""
Search a peak and its position in arrays xdata ad ydata.
Return three integer:
- peak position
- peak value
- index of peak position in array xdata
This result may accelerate the fwhm search.
"""
ymax = max(ydata)
idx = __give_index(ymax,ydata)
return xdata[idx],ymax,idx
def search_com(xdata,ydata):
"""
Return the center of mass in arrays xdata and ydata
"""
num = Numeric.sum(xdata*ydata)
denom = Numeric.sum(ydata)
try:
result = num/denom
except ZeroDivisionError:
result = 0
return result
def search_fwhm(xdata,ydata,peak=None,index=None):
"""
Search a fwhm and its center in arrays xdata and ydatas.
If no fwhm is found, (0,0) is returned.
peak and index which are coming from search_peak result, may
accelerate calculation
"""
if peak is None or index is None:
x,mypeak,index_peak = search_peak(xdata,ydata)
else:
mypeak = peak
index_peak = index
hm = mypeak/2
idx = index_peak
try:
while ydata[idx] >= hm:
idx = idx-1
x0 = xdata[idx]
x1 = xdata[idx+1]
y0 = ydata[idx]
y1 = ydata[idx+1]
lhmx = (hm*(x1-x0) - (y0*x1)+(y1*x0)) / (y1-y0)
except ZeroDivisionError:
lhmx = 0
except IndexError:
lhmx = xdata[0]
idx = index_peak
try:
while ydata[idx] >= hm:
idx = idx+1
x0 = xdata[idx]
x1 = xdata[idx+1]
y0 = ydata[idx]
y1 = ydata[idx+1]
uhmx = (hm*(x1-x0) - (y0*x1)+(y1*x0)) / (y1-y0)
except ZeroDivisionError:
uhmx = 0
except IndexError:
uhmx = xdata[-1]
FWHM = uhmx - lhmx
CFWHM = (uhmx+lhmx)/2
return FWHM,CFWHM
def __give_index(elem,array):
"""
Return the index of elem in array
"""
mylist = array.tolist()
return mylist.index(elem)
def test():
pass
if __name__ == '__main__':
test()
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