diff options
Diffstat (limited to 'astro/ps2d.py')
| -rwxr-xr-x | astro/ps2d.py | 44 |
1 files changed, 23 insertions, 21 deletions
diff --git a/astro/ps2d.py b/astro/ps2d.py index f1fd40b..5e8d2a6 100755 --- a/astro/ps2d.py +++ b/astro/ps2d.py @@ -170,31 +170,28 @@ class PS2D: Calculate the 2D power spectrum by cylindrically binning the above 3D power spectrum. """ - nz, ny, nx = self.cube.shape - k_x, k_y = self.k_xy - k_z = self.k_z - dkx = np.abs(k_x[0] - k_x[1]) - dkz = np.abs(k_z[0] - k_z[1]) - vcell = dkx**2 * dkz # volume of each cell [Mpc^-3] + logger.info("Calculating 2D power spectrum ...") + n_k_perp = len(self.k_perp) + n_k_los = len(self.k_los) + ps2d = np.zeros(shape=(n_k_los, n_k_perp)) # (k_los, k_perp) + eps = 1e-8 - ic_x = (np.abs(k_x) < eps).nonzero()[0][0] - ic_z = (np.abs(k_z) < eps).nonzero()[0][0] - p_x = np.arange(nx) - ic_x - p_z = np.abs(np.arange(nz) - ic_z) - mx, my = np.meshgrid(p_x, p_x) + ic_xy = (np.abs(self.k_xy) < eps).nonzero()[0][0] + ic_z = (np.abs(self.k_z) < eps).nonzero()[0][0] + p_xy = np.arange(self.Nx) - ic_xy + p_z = np.abs(np.arange(self.Nz) - ic_z) + mx, my = np.meshgrid(p_xy, p_xy) rho, phi = self.cart2pol(mx, my) rho = np.around(rho).astype(np.int) - n_k_perp = (nx+1) // 2 - n_k_los = (nz+1) // 2 - ps2d = np.zeros(shape=(n_k_los, n_k_perp)) # (k_los, k_perp) - logger.info("Calculating 2D PS by binning 3D PS ...") + + logger.info("Cylindrically averaging 3D power spectrum ...") for r in range(n_k_perp): ix, iy = (rho == r).nonzero() for s in range(n_k_los): iz = (p_z == s).nonzero()[0] cells = np.concatenate([self.ps3d[z, iy, ix] for z in iz]) - volume = cells.size * vcell - ps2d[s, r] = cells.sum() / volume + ps2d[s, r] = cells.mean() + self.ps2d = ps2d return ps2d @@ -330,7 +327,7 @@ class PS2D: NOTE: The Nyquist frequency just located at the first element after fftshift when the length is even, and it is negative. """ - k_x, k_y = self.k_xy + k_x = self.k_xy return k_x[k_x >= 0] @property @@ -379,6 +376,14 @@ class PS2D: hdr["CRVAL2P"] = (0.0, "coordinate of the reference pixel") hdr["CDELT2P"] = (dk_z, "coordinate delta/step") hdr["CUNIT2P"] = ("Mpc^-1", "coordinate unit") + # Data information + hdr["PixSize"] = (self.pixelsize, "[arcsec] data cube pixel size") + hdr["Z_C"] = (self.zc, "data cube central redshift") + hdr["Freq_C"] = (self.freqc, "[MHz] data cube central frequency") + hdr["Freq_Min"] = (self.frequencies.min(), + "[MHz] data cube minimum frequency") + hdr["Freq_Max"] = (self.frequencies.max(), + "[MHz] data cube maximum frequency") # Command history hdr.add_history(" ".join(sys.argv)) return hdr @@ -408,9 +413,6 @@ def main(): wcs = WCS(f[0].header) nfreq = cube.shape[0] frequencies = get_frequencies(wcs, nfreq) - logger.info("%d frequencies [MHz]:" % nfreq) - for f in frequencies: - logger.info("* %.2f" % f) ps2d = PS2D(cube=cube, pixelsize=args.pixelsize, frequencies=frequencies, window_name=args.window) ps2d.calc_ps3d() |