generate_data.py 2.46 KB
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import pyfstat
import numpy as np
import os

# Properties of the GW data
sqrtSX = 2e-23
tstart = 1000000000
Tspan = 100*86400
tend = tstart + Tspan

# Fixed properties of the signal
F0_center = 30
F1_center = 1e-10
F2 = 0
Alpha = 5e-3
Delta = 6e-2
tref = .5*(tstart+tend)

data_label = 'temp_data_{}'.format(os.getpid())
results_file_name = 'MCResults.txt'

VF0 = VF1 = 100
DeltaF0 = VF0 * np.sqrt(3)/(np.pi*Tspan)
DeltaF1 = VF1 * np.sqrt(45/4.)/(np.pi*Tspan**2)

depths = np.linspace(100, 250, 13)

run_setup = [((10, 0), 16, False),
             ((10, 0), 5, False),
             ((10, 10), 1, False)]
for depth in depths:
    h0 = sqrtSX / float(depth)
    r = np.random.uniform(0, 1)
    theta = np.random.uniform(0, 2*np.pi)
    F0 = F0_center + 3*np.sqrt(r)*np.cos(theta)/(np.pi**2 * Tspan**2)
    F1 = F1_center + 45*np.sqrt(r)*np.sin(theta)/(4*np.pi**2 * Tspan**4)

    psi = np.random.uniform(-np.pi/4, np.pi/4)
    phi = np.random.uniform(0, 2*np.pi)
    cosi = np.random.uniform(-1, 1)

    data = pyfstat.Writer(
        label=data_label, outdir='data', tref=tref,
        tstart=tstart, F0=F0, F1=F1, F2=F2, duration=Tspan, Alpha=Alpha,
        Delta=Delta, h0=h0, sqrtSX=sqrtSX, psi=psi, phi=phi, cosi=cosi,
        detector='H1,L1')
    data.make_data()
    predicted_twoF = data.predict_fstat()

    theta_prior = {'F0': {'type': 'unif',
                          'lower': F0-DeltaF0/2.,
                          'upper': F0+DeltaF0/2.},
                   'F1': {'type': 'unif',
                          'lower': F1-DeltaF1/2.,
                          'upper': F1+DeltaF1/2.},
                   'F2': F2,
                   'Alpha': Alpha,
                   'Delta': Delta
                   }

    ntemps = 1
    log10temperature_min = -1
    nwalkers = 50
    nsteps = [50, 50]

    mcmc = pyfstat.MCMCFollowUpSearch(
        label='temp', outdir='data',
        sftfilepath='data/*'+data_label+'*sft', theta_prior=theta_prior,
        tref=tref, minStartTime=tstart, maxStartTime=tend, nsteps=nsteps,
        nwalkers=nwalkers, ntemps=ntemps,
        log10temperature_min=log10temperature_min)
    mcmc.run(run_setup=run_setup, create_plots=False, log_table=False,
             gen_tex_table=False)
    d, maxtwoF = mcmc.get_max_twoF()
    dF0 = F0 - d['F0']
    dF1 = F1 - d['F1']
    with open(results_file_name, 'a') as f:
        f.write('{} {:1.8e} {:1.8e} {:1.8e} {:1.8e} {:1.8e}\n'
                .format(depth, h0, dF0, dF1, predicted_twoF, maxtwoF))
    os.system('rm data/temp*')