| 1 | __all_ = ['lagplotter']
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| 2 |
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| 3 | from asap.scantable import scantable
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| 4 | from matplotlib.pylab import *
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| 5 | from numpy import array, ma, logical_not
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| 6 | from numpy.fft import fft, ifft
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| 7 |
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| 8 | class lagplotter(object):
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| 9 | def __init__(self, stable):
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| 10 | if not isinstance(stable, scantable):
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| 11 | raise TypeError("This works only on scantables")
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| 12 | self._scan = stable
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| 13 | self.figure = None
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| 14 | self.dataaxes = None
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| 15 | self.fftaxes = None
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| 16 | self.resultaxes = None
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| 17 | self.flags = []
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| 18 |
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| 19 | def _init_plot(self):
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| 20 | if not self.figure:
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| 21 | self.figure = figure()
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| 22 | self.dataaxes = self.figure.add_subplot(3,1,1)
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| 23 | self.fftaxes = self.figure.add_subplot(3,1,2)
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| 24 | self.resultaxes = self.figure.add_subplot(3,1,3)
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| 25 | else:
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| 26 | self.dataaxes.cla()
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| 27 | self.fftaxes.cla()
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| 28 | self.resultaxes.cla()
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| 29 |
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| 30 |
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| 31 | def flag(self):
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| 32 | self._init_plot()
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| 33 | for i in xrange(len(self._scan)):
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| 34 | self.dataaxes.cla()
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| 35 | self.fftaxes.cla()
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| 36 | self.resultaxes.cla()
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| 37 | x = array(self._scan.get_abcissa(i)[0])
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| 38 | y = array(self._scan.get_spectrum(i))
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| 39 | msk = self._scan.get_mask(i)
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| 40 | marr = ma.MaskedArray(y, logical_not(msk), fill_value=0.0)
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| 41 | self.dataaxes.plot(x, marr)
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| 42 | nfft = len(marr)/2+1
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| 43 | yfft = fft(marr.filled())
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| 44 | self.fftaxes.semilogy(abs(yfft)[0:nfft])
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| 45 | self.figure.show()
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| 46 | raw_input("Press any key to continue...")
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| 47 | print "Now select a start and end point by clicking on the middle plot"
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| 48 | print "Start point ..."
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| 49 | flagstart = int(ginput(show_clicks=False)[0][0]+0.5)
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| 50 | print "End point ..."
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| 51 | flagend = int(ginput(show_clicks=False)[0][0]+0.5)
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| 52 | xfft = range(len(yfft))
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| 53 | self.fftaxes.axvspan(flagstart, flagend, alpha=0.3)
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| 54 | yfft[flagstart:flagend] = 0+0j
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| 55 | yfft[-flagend:-flagstart] = 0+0j
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| 56 | yi = ifft(yfft)
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| 57 | self.resultaxes.plot(x, yi)
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| 58 | self.figure.show()
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| 59 | inp = raw_input("Commit flags (c), keep (k) or ignore(i)? ")\
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| 60 | .lower()
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| 61 | if inp.startswith("c"):
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| 62 | self.flags.append([flagstart, flagend])
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| 63 | self._scan.set_spectrum(yi.real, i)
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| 64 | elif inp.startswith("k"):
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| 65 | self.flags.append([flagstart, flagend])
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| 66 | else:
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| 67 | del self.fftaxes.patches[-1]
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| 68 | cont = raw_input("Continue (c) or quit (q)? ")
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| 69 | if not cont == "c":
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| 70 | return self.flags
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| 71 | return self.flags
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