def recoil_params(self, plot=False):
'''
Calculate recoil parameters, SFD, iSFD, eSFD,... add them to instance
as attributes
'''
result = copy.copy(self)
# Split recoil into return loops as used by hystools.recoil
Hsplit, Msplit = [], []
for h, m in zip(self.H, self.M):
try:
[h1, h2], [m1, m2] = hys.split(h, m)
if len(h2) > 0.8*len(h1):
# don't append loops that haven't returned at least 80%
# Cut out first 10 points, where drift is happening
Hsplit.append(h2[10:])
Msplit.append(m2[10:])
except:
# split failed, probably incomplete loop.
pass
rec_params = hys.recoil(Hsplit, Msplit, startdef=1)
paramstosave = ['SFD', 'iSFD', 'eSFD', 'H_zminor', 'M_zminor']
# map to these attribute names
maptoattrib = ['SFD', 'iSFD', 'eSFD', 'H_zminor', 'M_zminor']
for p, m in zip(paramstosave, maptoattrib):
setattr(result, m, rec_params[p])
if self.verbose:
paramstoprint = ['SFD', 'iSFD', 'eSFD']
unitstoprint = ['Oe', 'Oe', 'Oe']
for param, unit in zip(paramstoprint, unitstoprint):
print(param.ljust(4) + ': {:.2f} {}'.format(rec_params[param], unit))
if plot:
# make summary plot
#plt.figure()
ishold = plt.ishold()
plt.plot(self.H[0], self.M[0])
plt.hold(True)
for h, m in zip(Hsplit[1:], Msplit[1:]):
plt.plot(h, m)
plt.plot(rec_params['H_zminor'], rec_params['M_zminor'], color='black', linewidth=3)
plt.scatter(*zip(*rec_params['plotpts']), c='g', s=30, zorder=3)
plt.grid(True)
plt.xlabel('Field (Oe)')
plt.ylabel('M (uemu)')
plt.title(os.path.split(self.filepath)[1])
plt.hold(ishold)
return result
def importdata(self, filepath, split=True, **kwargs):
# Read header and locate start of data
global bgfilepath
header = []
with open(filepath, 'r') as f:
# Name the enumerator, so it can be used after breaking from loop
fenum = enumerate(f)
for num, line in fenum:
if line == '[Data]\n':
skip = num + 2
break
else:
header.append(line)
#colnames = fenum.next()[1].split(',')
# Just import Temp, H and M from col 2, 3, and 4
try:
T, H, M = np.genfromtxt(filepath, skip_header=skip, delimiter=',',
unpack=True, usecols=(2,3,4))
# drop nan
nan = np.isnan(M)
M = M[~nan]
H = H[~nan]
T = T[~nan]
except:
# Data is invalid, or empty
self.H = []
self.M = []
self.T = []
self.filepath = filepath
print('Failed to load data from ' + filepath)
self.log = 'Failed to load data.\n'
return
# Get sample area from header
try:
area = float(header[10].split(',')[1][:5])
except:
area = None
if not filepath == bgfilepath and self.verbose:
print('Area could not be found in file header.')
# convert to uemu
M = M * 1000000
if split:
# split h and m into segments
Hsplit, Msplit = hys.split(H, M, shortest=20)
# split T too, but hys.split sucks
Hsplit, Tsplit = hys.split(H, T, shortest=20)
# Remove first and last few points
for i in range(len(Hsplit)):
Hsplit[i] = Hsplit[i][2:-2]
Msplit[i] = Msplit[i][2:-2]
Tsplit[i] = Tsplit[i][2:-2]
# put the segments back together in groups of two to form loops
Hloops = []
Mloops = []
Tloops = []
for j in range(0, len(Hsplit), 2):
try:
Hloops.append(np.append(Hsplit[j], Hsplit[j+1]))
Mloops.append(np.append(Msplit[j], Msplit[j+1]))
Tloops.append(np.append(Tsplit[j], Tsplit[j+1]))
except:
Hloops.append(Hsplit[j])
Mloops.append(Msplit[j])
Tloops.append(Tsplit[j])
self.M = Mloops
self.H = Hloops
self.T = Tloops
else:
# Leave M, H, T unsplit, list with len 1
self.M = [M]
self.H = [H]
self.T = [T]
self.filepath = filepath
self.area = area
self._thickness = None
self.header = header
self.log = '{}: PyPPMS version {}\n'.format(_importtime, _version)
self.log += '{}: Data imported from {}\n'.format(_now(), filepath)
if not filepath == bgfilepath:
print('Imported {} loops from {}'.format(len(self.H), os.path.split(filepath)[1]))
