cansas_reader_HDF5.py @ b39debba

Last change on this file since b39debba was bbd0f37, checked in by krzywon, 8 years ago
#826: CanSAS HDF5 reader reads in the Qdev data now.
Property mode set to `100644`
File size: 25.0 KB

Rev	Line
[68aa210]	1	"""
	2	CanSAS 2D data reader for reading HDF5 formatted CanSAS files.
	3	"""
	4
	5	import h5py
	6	import numpy as np
	7	import re
	8	import os
	9	import sys
	10
[d72567e]	11	from sas.sascalc.dataloader.data_info import plottable_1D, plottable_2D, Data1D, Data2D, DataInfo, Process, Aperture
	12	from sas.sascalc.dataloader.data_info import Collimation, TransmissionSpectrum, Detector
	13	from sas.sascalc.dataloader.data_info import combine_data_info_with_plottable
	14
[68aa210]	15
	16
	17	class Reader():
	18	"""
[ad52d31]	19	A class for reading in CanSAS v2.0 data files. The existing iteration opens Mantid generated HDF5 formatted files
	20	with file extension .h5/.H5. Any number of data sets may be present within the file and any dimensionality of data
	21	may be used. Currently 1D and 2D SAS data sets are supported, but future implementations will include 1D and 2D
[d72567e]	22	SESANS data.
	23
	24	Any number of SASdata sets may be present in a SASentry and the data within can be either 1D I(Q) or 2D I(Qx, Qy).
[68aa210]	25
[5e906207]	26	Also supports reading NXcanSAS formatted HDF5 files
	27
[68aa210]	28	:Dependencies:
[d72567e]	29	The CanSAS HDF5 reader requires h5py => v2.5.0 or later.
[68aa210]	30	"""
	31
	32	## CanSAS version
	33	cansas_version = 2.0
	34	## Logged warnings or messages
	35	logging = None
	36	## List of errors for the current data set
	37	errors = None
	38	## Raw file contents to be processed
	39	raw_data = None
[d72567e]	40	## Data info currently being read in
	41	current_datainfo = None
	42	## SASdata set currently being read in
[68aa210]	43	current_dataset = None
[d72567e]	44	## List of plottable1D objects that should be linked to the current_datainfo
	45	data1d = None
	46	## List of plottable2D objects that should be linked to the current_datainfo
	47	data2d = None
[68aa210]	48	## Data type name
[ad52d31]	49	type_name = "CanSAS 2.0"
[68aa210]	50	## Wildcards
[ad52d31]	51	type = ["CanSAS 2.0 HDF5 Files (.h5)\|.h5"]
[68aa210]	52	## List of allowed extensions
	53	ext = ['.h5', '.H5']
	54	## Flag to bypass extension check
	55	allow_all = False
	56	## List of files to return
	57	output = None
	58
	59	def read(self, filename):
	60	"""
[ad52d31]	61	This is the general read method that all SasView data_loaders must have.
[68aa210]	62
	63	:param filename: A path for an HDF5 formatted CanSAS 2D data file.
[d72567e]	64	:return: List of Data1D/2D objects and/or a list of errors.
[68aa210]	65	"""
[ad52d31]	66	## Reinitialize the class when loading a new data file to reset all class variables
[d72567e]	67	self.reset_class_variables()
[68aa210]	68	## Check that the file exists
	69	if os.path.isfile(filename):
	70	basename = os.path.basename(filename)
	71	_, extension = os.path.splitext(basename)
	72	# If the file type is not allowed, return empty list
	73	if extension in self.ext or self.allow_all:
	74	## Load the data file
	75	self.raw_data = h5py.File(filename, 'r')
	76	## Read in all child elements of top level SASroot
[d72567e]	77	self.read_children(self.raw_data, [])
[ad52d31]	78	## Add the last data set to the list of outputs
[68aa210]	79	self.add_data_set()
[995f4eb]	80	## Close the data file
	81	self.raw_data.close()
[68aa210]	82	## Return data set(s)
	83	return self.output
	84
[d72567e]	85	def reset_class_variables(self):
	86	"""
	87	Create the reader object and define initial states for class variables
	88	"""
	89	self.current_datainfo = None
	90	self.current_dataset = None
	91	self.data1d = []
	92	self.data2d = []
	93	self.raw_data = None
	94	self.errors = set()
	95	self.logging = []
	96	self.output = []
	97	self.parent_class = u''
	98	self.detector = Detector()
	99	self.collimation = Collimation()
	100	self.aperture = Aperture()
	101	self.process = Process()
	102	self.trans_spectrum = TransmissionSpectrum()
	103
	104	def read_children(self, data, parent_list):
[68aa210]	105	"""
[ad52d31]	106	A recursive method for stepping through the hierarchical data file.
[68aa210]	107
	108	:param data: h5py Group object of any kind
	109	:param parent: h5py Group parent name
	110	"""
	111
	112	## Loop through each element of the parent and process accordingly
	113	for key in data.keys():
	114	## Get all information for the current key
	115	value = data.get(key)
[d398285]	116	if value.attrs.get(u'canSAS_class') is not None:
	117	class_name = value.attrs.get(u'canSAS_class')
	118	else:
	119	class_name = value.attrs.get(u'NX_class')
[68aa210]	120	if class_name is not None:
	121	class_prog = re.compile(class_name)
	122	else:
	123	class_prog = re.compile(value.name)
	124
	125	if isinstance(value, h5py.Group):
[d72567e]	126	self.parent_class = class_name
	127	parent_list.append(key)
	128	## If this is a new sasentry, store the current data sets and create a fresh Data1D/2D object
[68aa210]	129	if class_prog.match(u'SASentry'):
	130	self.add_data_set(key)
[d72567e]	131	elif class_prog.match(u'SASdata'):
	132	self._initialize_new_data_set(parent_list)
[ad52d31]	133	## Recursion step to access data within the group
[d72567e]	134	self.read_children(value, parent_list)
	135	self.add_intermediate()
	136	parent_list.remove(key)
[68aa210]	137
	138	elif isinstance(value, h5py.Dataset):
	139	## If this is a dataset, store the data appropriately
	140	data_set = data[key][:]
[7bd6860a]	141	unit = self._get_unit(value)
[ac370c5]	142
[7bd6860a]	143	## I and Q Data
	144	if key == u'I':
	145	if type(self.current_dataset) is plottable_2D:
[ac370c5]	146	self.current_dataset.data = data_set
[7bd6860a]	147	self.current_dataset.zaxis("Intensity", unit)
	148	else:
	149	self.current_dataset.y = data_set.flatten()
	150	self.current_dataset.yaxis("Intensity", unit)
	151	continue
	152	elif key == u'Idev':
	153	if type(self.current_dataset) is plottable_2D:
	154	self.current_dataset.err_data = data_set.flatten()
	155	else:
	156	self.current_dataset.dy = data_set.flatten()
	157	continue
	158	elif key == u'Q':
	159	self.current_dataset.xaxis("Q", unit)
	160	if type(self.current_dataset) is plottable_2D:
	161	self.current_dataset.q = data_set.flatten()
	162	else:
	163	self.current_dataset.x = data_set.flatten()
	164	continue
[bbd0f37]	165	elif key == u'Qdev':
	166	self.current_dataset.dx = data_set.flatten()
	167	continue
[7bd6860a]	168	elif key == u'Qy':
	169	self.current_dataset.yaxis("Q_y", unit)
	170	self.current_dataset.qy_data = data_set.flatten()
	171	continue
	172	elif key == u'Qydev':
	173	self.current_dataset.dqy_data = data_set.flatten()
	174	continue
	175	elif key == u'Qx':
	176	self.current_dataset.xaxis("Q_x", unit)
	177	self.current_dataset.qx_data = data_set.flatten()
	178	continue
	179	elif key == u'Qxdev':
	180	self.current_dataset.dqx_data = data_set.flatten()
	181	continue
	182	elif key == u'Mask':
	183	self.current_dataset.mask = data_set.flatten()
	184	continue
[68aa210]	185
	186	for data_point in data_set:
	187	## Top Level Meta Data
	188	if key == u'definition':
[d72567e]	189	self.current_datainfo.meta_data['reader'] = data_point
[68aa210]	190	elif key == u'run':
[d72567e]	191	self.current_datainfo.run.append(data_point)
[be88076]	192	try:
	193	run_name = value.attrs['name']
	194	run_dict = {data_point: run_name}
	195	self.current_datainfo.run_name = run_dict
	196	except:
	197	pass
[68aa210]	198	elif key == u'title':
[d72567e]	199	self.current_datainfo.title = data_point
[68aa210]	200	elif key == u'SASnote':
[d72567e]	201	self.current_datainfo.notes.append(data_point)
[68aa210]	202
	203	## Sample Information
[eb98f24]	204	elif key == u'Title' and self.parent_class == u'SASsample': # CanSAS 2.0 format
[d72567e]	205	self.current_datainfo.sample.name = data_point
[ac3353d]	206	elif key == u'ID' and self.parent_class == u'SASsample': # NXcanSAS format
[88d85c6]	207	self.current_datainfo.sample.name = data_point
[d72567e]	208	elif key == u'thickness' and self.parent_class == u'SASsample':
	209	self.current_datainfo.sample.thickness = data_point
	210	elif key == u'temperature' and self.parent_class == u'SASsample':
	211	self.current_datainfo.sample.temperature = data_point
[5e906207]	212	elif key == u'transmission' and self.parent_class == u'SASsample':
	213	self.current_datainfo.sample.transmission = data_point
	214	elif key == u'x_position' and self.parent_class == u'SASsample':
	215	self.current_datainfo.sample.position.x = data_point
	216	elif key == u'y_position' and self.parent_class == u'SASsample':
	217	self.current_datainfo.sample.position.y = data_point
	218	elif key == u'polar_angle' and self.parent_class == u'SASsample':
	219	self.current_datainfo.sample.orientation.x = data_point
	220	elif key == u'azimuthal_angle' and self.parent_class == u'SASsample':
	221	self.current_datainfo.sample.orientation.z = data_point
	222	elif key == u'details' and self.parent_class == u'SASsample':
	223	self.current_datainfo.sample.details.append(data_point)
[68aa210]	224
[ad52d31]	225	## Instrumental Information
[d72567e]	226	elif key == u'name' and self.parent_class == u'SASinstrument':
	227	self.current_datainfo.instrument = data_point
	228	elif key == u'name' and self.parent_class == u'SASdetector':
[ad52d31]	229	self.detector.name = data_point
[d72567e]	230	elif key == u'SDD' and self.parent_class == u'SASdetector':
	231	self.detector.distance = float(data_point)
[d398285]	232	self.detector.distance_unit = unit
[5e906207]	233	elif key == u'slit_length' and self.parent_class == u'SASdetector':
	234	self.detector.slit_length = float(data_point)
	235	self.detector.slit_length_unit = unit
	236	elif key == u'x_position' and self.parent_class == u'SASdetector':
	237	self.detector.offset.x = float(data_point)
	238	self.detector.offset_unit = unit
	239	elif key == u'y_position' and self.parent_class == u'SASdetector':
	240	self.detector.offset.y = float(data_point)
	241	self.detector.offset_unit = unit
	242	elif key == u'polar_angle' and self.parent_class == u'SASdetector':
	243	self.detector.orientation.x = float(data_point)
	244	self.detector.orientation_unit = unit
	245	elif key == u'azimuthal_angle' and self.parent_class == u'SASdetector':
	246	self.detector.orientation.z = float(data_point)
	247	self.detector.orientation_unit = unit
	248	elif key == u'beam_center_x' and self.parent_class == u'SASdetector':
	249	self.detector.beam_center.x = float(data_point)
	250	self.detector.beam_center_unit = unit
	251	elif key == u'beam_center_y' and self.parent_class == u'SASdetector':
	252	self.detector.beam_center.y = float(data_point)
	253	self.detector.beam_center_unit = unit
	254	elif key == u'x_pixel_size' and self.parent_class == u'SASdetector':
	255	self.detector.pixel_size.x = float(data_point)
	256	self.detector.pixel_size_unit = unit
	257	elif key == u'y_pixel_size' and self.parent_class == u'SASdetector':
	258	self.detector.pixel_size.y = float(data_point)
	259	self.detector.pixel_size_unit = unit
[d72567e]	260	elif key == u'SSD' and self.parent_class == u'SAScollimation':
[ad52d31]	261	self.collimation.length = data_point
[d398285]	262	self.collimation.length_unit = unit
[d72567e]	263	elif key == u'name' and self.parent_class == u'SAScollimation':
[ad52d31]	264	self.collimation.name = data_point
	265
[68aa210]	266	## Process Information
[d72567e]	267	elif key == u'name' and self.parent_class == u'SASprocess':
[68aa210]	268	self.process.name = data_point
[eb98f24]	269	elif key == u'Title' and self.parent_class == u'SASprocess': # CanSAS 2.0 format
[68aa210]	270	self.process.name = data_point
[eb98f24]	271	elif key == u'name' and self.parent_class == u'SASprocess': # NXcanSAS format
[88d85c6]	272	self.process.name = data_point
[d72567e]	273	elif key == u'description' and self.parent_class == u'SASprocess':
[68aa210]	274	self.process.description = data_point
[d72567e]	275	elif key == u'date' and self.parent_class == u'SASprocess':
[68aa210]	276	self.process.date = data_point
[d72567e]	277	elif self.parent_class == u'SASprocess':
[ad52d31]	278	self.process.notes.append(data_point)
	279
	280	## Transmission Spectrum
[d72567e]	281	elif key == u'T' and self.parent_class == u'SAStransmission_spectrum':
[ad52d31]	282	self.trans_spectrum.transmission.append(data_point)
[d72567e]	283	elif key == u'Tdev' and self.parent_class == u'SAStransmission_spectrum':
[ad52d31]	284	self.trans_spectrum.transmission_deviation.append(data_point)
[d72567e]	285	elif key == u'lambda' and self.parent_class == u'SAStransmission_spectrum':
[ad52d31]	286	self.trans_spectrum.wavelength.append(data_point)
	287
[5e906207]	288	## Source
[d72567e]	289	elif key == u'wavelength' and self.parent_class == u'SASdata':
	290	self.current_datainfo.source.wavelength = data_point
[5e906207]	291	self.current_datainfo.source.wavelength_unit = unit
	292	elif key == u'incident_wavelength' and self.parent_class == u'SASsource':
	293	self.current_datainfo.source.wavelength = data_point
	294	self.current_datainfo.source.wavelength_unit = unit
	295	elif key == u'wavelength_max' and self.parent_class == u'SASsource':
	296	self.current_datainfo.source.wavelength_max = data_point
	297	self.current_datainfo.source.wavelength_max_unit = unit
	298	elif key == u'wavelength_min' and self.parent_class == u'SASsource':
	299	self.current_datainfo.source.wavelength_min = data_point
	300	self.current_datainfo.source.wavelength_min_unit = unit
	301	elif key == u'wavelength_spread' and self.parent_class == u'SASsource':
	302	self.current_datainfo.source.wavelength_spread = data_point
	303	self.current_datainfo.source.wavelength_spread_unit = unit
	304	elif key == u'beam_size_x' and self.parent_class == u'SASsource':
	305	self.current_datainfo.source.beam_size.x = data_point
	306	self.current_datainfo.source.beam_size_unit = unit
	307	elif key == u'beam_size_y' and self.parent_class == u'SASsource':
	308	self.current_datainfo.source.beam_size.y = data_point
	309	self.current_datainfo.source.beam_size_unit = unit
	310	elif key == u'beam_shape' and self.parent_class == u'SASsource':
	311	self.current_datainfo.source.beam_shape = data_point
[d72567e]	312	elif key == u'radiation' and self.parent_class == u'SASsource':
	313	self.current_datainfo.source.radiation = data_point
	314	elif key == u'transmission' and self.parent_class == u'SASdata':
	315	self.current_datainfo.sample.transmission = data_point
[68aa210]	316
	317	## Everything else goes in meta_data
	318	else:
[d72567e]	319	new_key = self._create_unique_key(self.current_datainfo.meta_data, key)
	320	self.current_datainfo.meta_data[new_key] = data_point
[68aa210]	321
	322	else:
	323	## I don't know if this reachable code
	324	self.errors.add("ShouldNeverHappenException")
	325
[d72567e]	326	def add_intermediate(self):
[ad52d31]	327	"""
	328	This method stores any intermediate objects within the final data set after fully reading the set.
	329
	330	:param parent: The NXclass name for the h5py Group object that just finished being processed
	331	"""
	332
[d72567e]	333	if self.parent_class == u'SASprocess':
	334	self.current_datainfo.process.append(self.process)
[ad52d31]	335	self.process = Process()
[d72567e]	336	elif self.parent_class == u'SASdetector':
	337	self.current_datainfo.detector.append(self.detector)
[ad52d31]	338	self.detector = Detector()
[d72567e]	339	elif self.parent_class == u'SAStransmission_spectrum':
	340	self.current_datainfo.trans_spectrum.append(self.trans_spectrum)
[ad52d31]	341	self.trans_spectrum = TransmissionSpectrum()
[d72567e]	342	elif self.parent_class == u'SAScollimation':
	343	self.current_datainfo.collimation.append(self.collimation)
[ad52d31]	344	self.collimation = Collimation()
[d72567e]	345	elif self.parent_class == u'SASaperture':
[ad52d31]	346	self.collimation.aperture.append(self.aperture)
	347	self.aperture = Aperture()
[d72567e]	348	elif self.parent_class == u'SASdata':
	349	if type(self.current_dataset) is plottable_2D:
	350	self.data2d.append(self.current_dataset)
	351	elif type(self.current_dataset) is plottable_1D:
	352	self.data1d.append(self.current_dataset)
[68aa210]	353
	354	def final_data_cleanup(self):
	355	"""
[d72567e]	356	Does some final cleanup and formatting on self.current_datainfo and all data1D and data2D objects and then
	357	combines the data and info into Data1D and Data2D objects
[68aa210]	358	"""
	359
[d72567e]	360	## Type cast data arrays to float64
	361	if len(self.current_datainfo.trans_spectrum) > 0:
[ad52d31]	362	spectrum_list = []
[d72567e]	363	for spectrum in self.current_datainfo.trans_spectrum:
[ad52d31]	364	spectrum.transmission = np.delete(spectrum.transmission, [0])
	365	spectrum.transmission = spectrum.transmission.astype(np.float64)
	366	spectrum.transmission_deviation = np.delete(spectrum.transmission_deviation, [0])
	367	spectrum.transmission_deviation = spectrum.transmission_deviation.astype(np.float64)
	368	spectrum.wavelength = np.delete(spectrum.wavelength, [0])
	369	spectrum.wavelength = spectrum.wavelength.astype(np.float64)
[d72567e]	370	if len(spectrum.transmission) > 0:
	371	spectrum_list.append(spectrum)
	372	self.current_datainfo.trans_spectrum = spectrum_list
[68aa210]	373
	374	## Append errors to dataset and reset class errors
[d72567e]	375	self.current_datainfo.errors = self.errors
[68aa210]	376	self.errors.clear()
	377
[d72567e]	378	## Combine all plottables with datainfo and append each to output
	379	## Type cast data arrays to float64 and find min/max as appropriate
	380	for dataset in self.data2d:
	381	dataset.data = dataset.data.astype(np.float64)
	382	dataset.err_data = dataset.err_data.astype(np.float64)
	383	if dataset.qx_data is not None:
	384	dataset.xmin = np.min(dataset.qx_data)
	385	dataset.xmax = np.max(dataset.qx_data)
	386	dataset.qx_data = dataset.qx_data.astype(np.float64)
	387	if dataset.dqx_data is not None:
	388	dataset.dqx_data = dataset.dqx_data.astype(np.float64)
	389	if dataset.qy_data is not None:
	390	dataset.ymin = np.min(dataset.qy_data)
	391	dataset.ymax = np.max(dataset.qy_data)
	392	dataset.qy_data = dataset.qy_data.astype(np.float64)
	393	if dataset.dqy_data is not None:
	394	dataset.dqy_data = dataset.dqy_data.astype(np.float64)
	395	if dataset.q_data is not None:
	396	dataset.q_data = dataset.q_data.astype(np.float64)
	397	zeros = np.ones(dataset.data.size, dtype=bool)
	398	try:
	399	for i in range (0, dataset.mask.size - 1):
	400	zeros[i] = dataset.mask[i]
	401	except:
	402	self.errors.add(sys.exc_value)
	403	dataset.mask = zeros
	404	## Calculate the actual Q matrix
	405	try:
	406	if dataset.q_data.size <= 1:
	407	dataset.q_data = np.sqrt(dataset.qx_data * dataset.qx_data + dataset.qy_data * dataset.qy_data)
	408	except:
	409	dataset.q_data = None
[ac370c5]	410
	411	if dataset.data.ndim == 2:
	412	(n_rows, n_cols) = dataset.data.shape
[479799c]	413	dataset.y_bins = dataset.qy_data[0::n_cols]
[ac370c5]	414	dataset.x_bins = dataset.qx_data[:n_cols]
	415	dataset.data = dataset.data.flatten()
	416
[d72567e]	417	final_dataset = combine_data_info_with_plottable(dataset, self.current_datainfo)
	418	self.output.append(final_dataset)
	419
	420	for dataset in self.data1d:
	421	if dataset.x is not None:
	422	dataset.x = dataset.x.astype(np.float64)
	423	dataset.xmin = np.min(dataset.x)
	424	dataset.xmax = np.max(dataset.x)
	425	if dataset.y is not None:
	426	dataset.y = dataset.y.astype(np.float64)
	427	dataset.ymin = np.min(dataset.y)
	428	dataset.ymax = np.max(dataset.y)
	429	if dataset.dx is not None:
	430	dataset.dx = dataset.dx.astype(np.float64)
	431	if dataset.dxl is not None:
	432	dataset.dxl = dataset.dxl.astype(np.float64)
	433	if dataset.dxw is not None:
	434	dataset.dxw = dataset.dxw.astype(np.float64)
	435	if dataset.dy is not None:
	436	dataset.dy = dataset.dy.astype(np.float64)
	437	final_dataset = combine_data_info_with_plottable(dataset, self.current_datainfo)
	438	self.output.append(final_dataset)
	439
[68aa210]	440	def add_data_set(self, key=""):
	441	"""
	442	Adds the current_dataset to the list of outputs after preforming final processing on the data and then calls a
	443	private method to generate a new data set.
	444
	445	:param key: NeXus group name for current tree level
	446	"""
[d72567e]	447
	448	if self.current_datainfo and self.current_dataset:
[68aa210]	449	self.final_data_cleanup()
[d72567e]	450	self.data1d = []
	451	self.data2d = []
	452	self.current_datainfo = DataInfo()
[68aa210]	453
[54ba66e]	454
[d72567e]	455	def _initialize_new_data_set(self, parent_list = None):
[68aa210]	456	"""
	457	A private class method to generate a new 1D or 2D data object based on the type of data within the set.
	458	Outside methods should call add_data_set() to be sure any existing data is stored properly.
	459
[d72567e]	460	:param parent_list: List of names of parent elements
[68aa210]	461	"""
[d72567e]	462
	463	if parent_list is None:
	464	parent_list = []
	465	if self._find_intermediate(parent_list, "Qx"):
	466	self.current_dataset = plottable_2D()
[68aa210]	467	else:
	468	x = np.array(0)
	469	y = np.array(0)
[d72567e]	470	self.current_dataset = plottable_1D(x, y)
	471	self.current_datainfo.filename = self.raw_data.filename
[68aa210]	472
[d72567e]	473	def _find_intermediate(self, parent_list, basename=""):
[ad52d31]	474	"""
	475	A private class used to find an entry by either using a direct key or knowing the approximate basename.
	476
[d72567e]	477	:param parent_list: List of parents to the current level in the HDF5 file
	478	:param basename: Approximate name of an entry to search for
[ad52d31]	479	:return:
	480	"""
[d72567e]	481
	482	entry = False
	483	key_prog = re.compile(basename)
	484	top = self.raw_data
	485	for parent in parent_list:
	486	top = top.get(parent)
	487	for key in top.keys():
	488	if (key_prog.match(key)):
	489	entry = True
	490	break
[ad52d31]	491	return entry
	492
[68aa210]	493	def _create_unique_key(self, dictionary, name, numb=0):
	494	"""
	495	Create a unique key value for any dictionary to prevent overwriting
	496	Recurses until a unique key value is found.
	497
	498	:param dictionary: A dictionary with any number of entries
	499	:param name: The index of the item to be added to dictionary
	500	:param numb: The number to be appended to the name, starts at 0
[d72567e]	501	:return: The new name for the dictionary entry
[68aa210]	502	"""
	503	if dictionary.get(name) is not None:
	504	numb += 1
	505	name = name.split("_")[0]
	506	name += "_{0}".format(numb)
	507	name = self._create_unique_key(dictionary, name, numb)
[d398285]	508	return name
	509
	510	def _get_unit(self, value):
	511	"""
	512	Find the unit for a particular value within the h5py dictionary
	513
	514	:param value: attribute dictionary for a particular value set
[d72567e]	515	:return: unit for the value passed to the method
[d398285]	516	"""
	517	unit = value.attrs.get(u'units')
	518	if unit == None:
	519	unit = value.attrs.get(u'unit')
	520	## Convert the unit formats
	521	if unit == "1/A":
	522	unit = "A^{-1}"
	523	elif unit == "1/cm":
	524	unit = "cm^{-1}"
[54ba66e]	525	return unit

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SasView

source: sasview/src/sas/sascalc/dataloader/readers/cansas_reader_HDF5.py @ b39debba

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