def subtractline(self, ms=150, fitrange=('98%', '100%')):
''' Subtract a line such that the loop end points are at Ms '''
result = copy.copy(self)
result.M = []
for H,M in zip(self.H, self.M):
# find current end points, subtract to get close
amp, offs = hys.normalize(H, M, fitrange=('95%', '100%'), fitbranch=False)
maxH = max(abs(H))
M = M - (amp-ms)*H/maxH
# Do it again to get decent result
amp, offs = hys.normalize(H, M, fitrange=fitrange, fitbranch=False)
result.M.append(M - (amp-ms)*H/maxH)
return result
def normalize(self, fitrange=('85%', '99%'), usefirst=False):
'''
Normalize loop based on data in fit range
'''
result = copy.copy(self)
result.M = []
fitrange = hys.valid_fitrange(fitrange)
first = True
for H,M in zip(self.H, self.M):
if not first and usefirst:
result.M.append((M - offset) / amp)
continue
amp, offset = hys.normalize(H, M, fitrange, fitbranch=False)
result.M.append((M - offset) / amp)
first = False
result.log += '{}: Normalized, fitrange={}, usefirst={}\n'.format(_now(), fitrange, usefirst)
return result