Source code for hendrics.exvar

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
Created on Thu Aug 17 08:55:47 2017

@author: marta

from astropy import log
from stingray.utils import excess_variance
from .io import load_lcurve
from .io import save_as_qdp
from .base import hen_root

[docs] def fvar(lc): return excess_variance(lc, normalization="fvar")
[docs] def excvar_none(lc): return excess_variance(lc, normalization="none")
[docs] def excvar_norm(lc): return excess_variance(lc, normalization="norm_xs")
[docs] def main(args=None): import argparse from .base import _add_default_args, check_negative_numbers_in_args description = "Calculate excess variance in light curve chunks" parser = argparse.ArgumentParser(description=description) parser.add_argument("files", help="List of files", nargs="+") parser.add_argument( "-c", "--chunk-length", type=float, default=20, help="Length in seconds of the light curve chunks", ) parser.add_argument( "--fraction-step", type=float, default=0.5, help="If the step is not a full chunk_length but less," "this indicates the ratio between step step and" " `chunk_length`", ) parser.add_argument( "--norm", type=str, default="excvar", help="Choose between fvar, excvar and norm_excvar " "normalization, referring to Fvar, excess " "variance, and normalized excess variance " "respectively (see" " Vaughan et al. 2003 for details).", ) _add_default_args(parser, ["loglevel", "debug"]) args = check_negative_numbers_in_args(args) args = parser.parse_args(args) if args.debug: args.loglevel = "DEBUG" log.setLevel(args.loglevel) with log.log_to_file("HENexcvar.log"): filelist = [] for fname in args.files: lcurve = load_lcurve(fname) if args.norm == "fvar": start, stop, res = lcurve.analyze_segments( fvar, args.chunk_length, args.fraction_step ) elif args.norm == "excvar": start, stop, res = lcurve.analyze_segments( excvar_none, args.chunk_length, args.fraction_step ) elif args.norm == "norm_excvar": start, stop, res = lcurve.analyze_segments( excvar_norm, args.chunk_length, args.fraction_step ) else: raise ValueError("Normalization must be fvar, norm_excvar " "or excvar") var, var_err = res out = hen_root(fname) + "_" + args.norm + ".qdp" save_as_qdp( [(start + stop) / 2, var], [(stop - start) / 2, var_err], filename=out, ) filelist.append(out) return filelist