diff options
Diffstat (limited to 'astro')
| -rwxr-xr-x | astro/ps2d.py | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/astro/ps2d.py b/astro/ps2d.py index e3548b8..38f9f9f 100755 --- a/astro/ps2d.py +++ b/astro/ps2d.py @@ -96,17 +96,17 @@ class PS2D: meanstd : bool, optional if ``True``, calculate the mean and standard deviation for each power bin instead of the median and 68% IQR. + unit : str, optional + unit of the cube data; will be used to determine the power spectrum + unit as well as the plot labels. window_name : str, optional if specified, taper the cube along the frequency axis using the specified window. window_width : str, optional if ``extended`` then use the extended window instead. - unit : str, optional - unit of the cube data; will be used to determine the power spectrum - unit as well as the plot labels. """ def __init__(self, cube, pixelsize, frequencies, meanstd=False, - window_name=None, window_width="extended", unit="???"): + unit="???", window_name=None, window_width=None): logger.info("Initializing PS2D instance ...") self.cube = np.array(cube, dtype=float) self.pixelsize = pixelsize # [arcsec] @@ -139,25 +139,24 @@ class PS2D: self.window_width = window_width self.window = self.gen_window(name=window_name, width=window_width) - def gen_window(self, name=None, width="extended"): + def gen_window(self, name=None, width=None): if name is None: return None window_func = getattr(signal.windows, name) + nfreq = self.nfreq + window = window_func(nfreq, sym=False) + width_pix = self.nfreq if width == "extended": - w = window_func(self.nfreq, sym=False) - ex = 1.0 / (w.sum() / self.nfreq) - width_pix = int(ex * self.nfreq) - else: - width_pix = self.nfreq - - window = window_func(width_pix, sym=False) - if len(window) > self.nfreq: + ex = 1.0 / (window.sum() / nfreq) + width_pix = int(ex * nfreq) + window = window_func(width_pix, sym=False) # cut the filter midx = int(len(window) / 2) # index of the peak element - nleft = int(self.nfreq / 2) # number of element on the left - nright = int((self.nfreq-1) / 2) # number of element on the right + nleft = int(nfreq / 2) # number of element on the left + nright = int((nfreq-1) / 2) # number of element on the right window = window[(midx-nleft):(midx+nright+1)] + logger.info("Generated window: %s (%s/%d)" % (name, width, width_pix)) return window @@ -420,6 +419,9 @@ class PS2D: else: hdr["AvgType"] = ("median + 68% IQR", "average type") + hdr["WINDOW"] = (self.window_name, "window applied along LoS") + hdr["WinWidth"] = (self.window_width, "window width") + # Physical coordinates: IRAF LTM/LTV # Li{Image} = LTMi_i * Pi{Physical} + LTVi # Reference: ftp://iraf.noao.edu/iraf/web/projects/fitswcs/specwcs.html @@ -476,6 +478,10 @@ def main(): choices=["nuttall"], help="apply window along frequency axis " + "(default: None)") + parser.add_argument("--window-width", dest="window_width", + choices=["extended"], + help="width of the window to adjust its shape " + + "(default: None, i.e., standard)") parser.add_argument("-i", "--infile", dest="infile", nargs="+", help="input FITS image cube(s); if multiple cubes " + "are provided, they are added first.") @@ -511,7 +517,8 @@ def main(): pixelsize = abs(wcs.wcs.cdelt[0]) * 3600 # [deg] -> [arcsec] ps2d = PS2D(cube=cube, pixelsize=pixelsize, frequencies=frequencies, - meanstd=args.meanstd, window_name=args.window, unit=bunit) + meanstd=args.meanstd, unit=bunit, + window_name=args.window, window_width=args.window_width) ps2d.calc_ps3d() ps2d.calc_ps2d() ps2d.save(outfile=args.outfile, clobber=args.clobber) |