Directed grid search: Linear spindown

Search for CW signal including one spindown parameter using a parameter space grid (i.e. no MCMC).

 import pyfstat
 import numpy as np
 import os

 label = "PyFstat_example_grid_search_F0F1"
 outdir = os.path.join("PyFstat_example_data", label)

 F0 = 30.0
 F1 = 1e-10
 F2 = 0
 Alpha = 1.0
 Delta = 1.5

 # Properties of the GW data
 sqrtSX = 1e-23
 tstart = 1000000000
 duration = 10 * 86400
 tend = tstart + duration
 tref = 0.5 * (tstart + tend)
 IFOs = "H1"

 depth = 20

 h0 = sqrtSX / depth
 cosi = 0

 data = pyfstat.Writer(
     label=label,
     outdir=outdir,
     tref=tref,
     tstart=tstart,
     F0=F0,
     F1=F1,
     F2=F2,
     duration=duration,
     Alpha=Alpha,
     Delta=Delta,
     h0=h0,
     cosi=cosi,
     sqrtSX=sqrtSX,
     detectors=IFOs,
 )
 data.make_data()

 m = 0.01
 dF0 = np.sqrt(12 * m) / (np.pi * duration)
 dF1 = np.sqrt(180 * m) / (np.pi * duration ** 2)
 dF2 = 1e-17
 N = 100
 DeltaF0 = N * dF0
 DeltaF1 = N * dF1
 F0s = [F0 - DeltaF0 / 2.0, F0 + DeltaF0 / 2.0, dF0]
 F1s = [F1 - DeltaF1 / 2.0, F1 + DeltaF1 / 2.0, dF1]
 F2s = [F2]
 Alphas = [Alpha]
 Deltas = [Delta]
 search = pyfstat.GridSearch(
     label,
     outdir,
     data.sftfilepath,
     F0s,
     F1s,
     F2s,
     Alphas,
     Deltas,
     tref,
     tstart,
     tend,
 )
 search.run()

 print("Plotting 2F(F0)...")
 search.plot_1D(xkey="F0", xlabel="freq [Hz]", ylabel="$2\\mathcal{F}$")
 print("Plotting 2F(F1)...")
 search.plot_1D(xkey="F1")
 print("Plotting 2F(F0,F1)...")
 search.plot_2D(xkey="F0", ykey="F1", colorbar=True)

 print("Making gridcorner plot...")
 F0_vals = np.unique(search.data["F0"]) - F0
 F1_vals = np.unique(search.data["F1"]) - F1
 twoF = search.data["twoF"].reshape((len(F0_vals), len(F1_vals)))
 xyz = [F0_vals, F1_vals]
 labels = [
     "$f - f_0$",
     "$\\dot{f} - \\dot{f}_0$",
     "$\\widetilde{2\\mathcal{F}}$",
 ]
 fig, axes = pyfstat.gridcorner(
     twoF, xyz, projection="log_mean", labels=labels, whspace=0.1, factor=1.8
 )
 fig.savefig(os.path.join(outdir, label + "_projection_matrix.png"))