abs_reader.py @ c1e380e

ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalc

Last change on this file since c1e380e was 959eb01, checked in by ajj, 8 years ago
normalising line endings
Property mode set to `100644`
File size: 10.6 KB

Rev	Line
[959eb01]	1	"""
	2	"""
	3	#####################################################################
	4	#This software was developed by the University of Tennessee as part of the
	5	#Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
	6	#project funded by the US National Science Foundation.
	7	#See the license text in license.txt
	8	#copyright 2008, University of Tennessee
	9	######################################################################
	10
	11	import numpy as np
	12	import os
	13	from sas.sascalc.dataloader.data_info import Data1D
	14	from sas.sascalc.dataloader.data_info import Detector
	15
	16	has_converter = True
	17	try:
	18	from sas.sascalc.data_util.nxsunit import Converter
	19	except:
	20	has_converter = False
	21
	22
	23	class Reader:
	24	"""
	25	Class to load IGOR reduced .ABS files
	26	"""
	27	## File type
	28	type_name = "IGOR 1D"
	29	## Wildcards
	30	type = ["IGOR 1D files (.abs)\|.abs"]
	31	## List of allowed extensions
	32	ext = ['.abs', '.ABS']
	33
	34	def read(self, path):
	35	"""
	36	Load data file.
	37
	38	:param path: file path
	39
	40	:return: Data1D object, or None
	41
	42	:raise RuntimeError: when the file can't be opened
	43	:raise ValueError: when the length of the data vectors are inconsistent
	44	"""
	45	if os.path.isfile(path):
	46	basename = os.path.basename(path)
	47	root, extension = os.path.splitext(basename)
	48	if extension.lower() in self.ext:
	49	try:
	50	input_f = open(path,'r')
	51	except:
	52	raise RuntimeError, "abs_reader: cannot open %s" % path
	53	buff = input_f.read()
	54	lines = buff.split('\n')
	55	x = np.zeros(0)
	56	y = np.zeros(0)
	57	dy = np.zeros(0)
	58	dx = np.zeros(0)
	59	output = Data1D(x, y, dy=dy, dx=dx)
	60	detector = Detector()
	61	output.detector.append(detector)
	62	output.filename = basename
	63
	64	is_info = False
	65	is_center = False
	66	is_data_started = False
	67
	68	data_conv_q = None
	69	data_conv_i = None
	70
	71	if has_converter == True and output.x_unit != '1/A':
	72	data_conv_q = Converter('1/A')
	73	# Test it
	74	data_conv_q(1.0, output.x_unit)
	75
	76	if has_converter == True and output.y_unit != '1/cm':
	77	data_conv_i = Converter('1/cm')
	78	# Test it
	79	data_conv_i(1.0, output.y_unit)
	80
	81	for line in lines:
	82
	83	# Information line 1
	84	if is_info == True:
	85	is_info = False
	86	line_toks = line.split()
	87
	88	# Wavelength in Angstrom
	89	try:
	90	value = float(line_toks[1])
	91	if has_converter == True and \
	92	output.source.wavelength_unit != 'A':
	93	conv = Converter('A')
	94	output.source.wavelength = conv(value,
	95	units=output.source.wavelength_unit)
	96	else:
	97	output.source.wavelength = value
	98	except:
	99	#goes to ASC reader
	100	msg = "abs_reader: cannot open %s" % path
	101	raise RuntimeError, msg
	102
	103	# Distance in meters
	104	try:
	105	value = float(line_toks[3])
	106	if has_converter == True and \
	107	detector.distance_unit != 'm':
	108	conv = Converter('m')
	109	detector.distance = conv(value,
	110	units=detector.distance_unit)
	111	else:
	112	detector.distance = value
	113	except:
	114	#goes to ASC reader
	115	msg = "abs_reader: cannot open %s" % path
	116	raise RuntimeError, msg
	117	# Transmission
	118	try:
	119	output.sample.transmission = float(line_toks[4])
	120	except:
	121	# Transmission is not a mandatory entry
	122	pass
	123
	124	# Thickness in mm
	125	try:
	126	value = float(line_toks[5])
	127	if has_converter == True and \
	128	output.sample.thickness_unit != 'cm':
	129	conv = Converter('cm')
	130	output.sample.thickness = conv(value,
	131	units=output.sample.thickness_unit)
	132	else:
	133	output.sample.thickness = value
	134	except:
	135	# Thickness is not a mandatory entry
	136	pass
	137
	138	#MON CNT LAMBDA DET ANG DET DIST TRANS THICK
	139	# AVE STEP
	140	if line.count("LAMBDA") > 0:
	141	is_info = True
	142
	143	# Find center info line
	144	if is_center == True:
	145	is_center = False
	146	line_toks = line.split()
	147	# Center in bin number
	148	center_x = float(line_toks[0])
	149	center_y = float(line_toks[1])
	150
	151	# Bin size
	152	if has_converter == True and \
	153	detector.pixel_size_unit != 'mm':
	154	conv = Converter('mm')
	155	detector.pixel_size.x = conv(5.0,
	156	units=detector.pixel_size_unit)
	157	detector.pixel_size.y = conv(5.0,
	158	units=detector.pixel_size_unit)
	159	else:
	160	detector.pixel_size.x = 5.0
	161	detector.pixel_size.y = 5.0
	162
	163	# Store beam center in distance units
	164	# Det 640 x 640 mm
	165	if has_converter == True and \
	166	detector.beam_center_unit != 'mm':
	167	conv = Converter('mm')
	168	detector.beam_center.x = conv(center_x * 5.0,
	169	units=detector.beam_center_unit)
	170	detector.beam_center.y = conv(center_y * 5.0,
	171	units=detector.beam_center_unit)
	172	else:
	173	detector.beam_center.x = center_x * 5.0
	174	detector.beam_center.y = center_y * 5.0
	175
	176	# Detector type
	177	try:
	178	detector.name = line_toks[7]
	179	except:
	180	# Detector name is not a mandatory entry
	181	pass
	182
	183	#BCENT(X,Y) A1(mm) A2(mm) A1A2DIST(m) DL/L
	184	# BSTOP(mm) DET_TYP
	185	if line.count("BCENT") > 0:
	186	is_center = True
	187
	188	# Parse the data
	189	if is_data_started == True:
	190	toks = line.split()
	191
	192	try:
	193	_x = float(toks[0])
	194	_y = float(toks[1])
	195	_dy = float(toks[2])
	196	_dx = float(toks[3])
	197
	198	if data_conv_q is not None:
	199	_x = data_conv_q(_x, units=output.x_unit)
	200	_dx = data_conv_i(_dx, units=output.x_unit)
	201
	202	if data_conv_i is not None:
	203	_y = data_conv_i(_y, units=output.y_unit)
	204	_dy = data_conv_i(_dy, units=output.y_unit)
	205
	206	x = np.append(x, _x)
	207	y = np.append(y, _y)
	208	dy = np.append(dy, _dy)
	209	dx = np.append(dx, _dx)
	210
	211	except:
	212	# Could not read this data line. If we are here
	213	# it is because we are in the data section. Just
	214	# skip it.
	215	pass
	216
	217	#The 6 columns are \| Q (1/A) \| I(Q) (1/cm) \| std. dev.
	218	# I(Q) (1/cm) \| sigmaQ \| meanQ \| ShadowFactor\|
	219	if line.count("The 6 columns") > 0:
	220	is_data_started = True
	221
	222	# Sanity check
	223	if not len(y) == len(dy):
	224	msg = "abs_reader: y and dy have different length"
	225	raise ValueError, msg
	226	# If the data length is zero, consider this as
	227	# though we were not able to read the file.
	228	if len(x) == 0:
	229	raise ValueError, "ascii_reader: could not load file"
	230
	231	output.x = x[x != 0]
	232	output.y = y[x != 0]
	233	output.dy = dy[x != 0]
	234	output.dx = dx[x != 0]
	235	if data_conv_q is not None:
	236	output.xaxis("\\rm{Q}", output.x_unit)
	237	else:
	238	output.xaxis("\\rm{Q}", 'A^{-1}')
	239	if data_conv_i is not None:
	240	output.yaxis("\\rm{Intensity}", output.y_unit)
	241	else:
	242	output.yaxis("\\rm{Intensity}", "cm^{-1}")
	243
	244	# Store loading process information
	245	output.meta_data['loader'] = self.type_name
	246	return output
	247	else:
	248	raise RuntimeError, "%s is not a file" % path
	249	return None

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source: sasview/src/sas/sascalc/dataloader/readers/abs_reader.py @ c1e380e

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