| [297] | 1 | import _asap
|
|---|
| 2 |
|
|---|
| 3 | class linefinder:
|
|---|
| 4 | """
|
|---|
| 5 | The class for automated spectral line search in ASAP.
|
|---|
| 6 | """
|
|---|
| 7 |
|
|---|
| 8 | def __init__(self):
|
|---|
| 9 | """
|
|---|
| 10 | Create a line finder object.
|
|---|
| 11 | """
|
|---|
| 12 | self.finder = _asap.linefinder()
|
|---|
| 13 | return
|
|---|
| 14 |
|
|---|
| 15 | def set_scan(self,scan,mask=None,edge=(0,0)):
|
|---|
| 16 | """
|
|---|
| 17 | Set the 'data' (scantable) to work with.
|
|---|
| 18 | Parameters:
|
|---|
| 19 | scan: a scantable
|
|---|
| 20 | mask: an optional mask retreived from scantable
|
|---|
| 21 | edge: an optional number of channel to drop at
|
|---|
| 22 | the edge of spectrum. If only one value is
|
|---|
| 23 | specified, the same number will be dropped from
|
|---|
| 24 | both sides of the spectrum. Default is to keep
|
|---|
| 25 | all channels
|
|---|
| 26 | """
|
|---|
| 27 | if not scan:
|
|---|
| 28 | raise RuntimeError, 'Please give a correct scan'
|
|---|
| 29 | if len(edge)>2:
|
|---|
| 30 | raise RuntimeError, "The edge parameter should have two \
|
|---|
| 31 | or less elements"
|
|---|
| 32 | if mask is None:
|
|---|
| 33 | from numarray import ones
|
|---|
| 34 | self.finder.setscan(scan,ones(scan.nchan()),edge)
|
|---|
| 35 | else:
|
|---|
| 36 | self.finder.setscan(scan,mask,edge)
|
|---|
| 37 | return
|
|---|
| 38 | def find_lines(self):
|
|---|
| 39 | """
|
|---|
| 40 | Search for spectral lines in the scan assigned in set_scan.
|
|---|
| 41 | A number of lines found will be returned
|
|---|
| 42 | """
|
|---|
| 43 | return self.finder.findlines()
|
|---|
| 44 | def get_mask(self,invert=False):
|
|---|
| 45 | """
|
|---|
| 46 | Get the mask to mask out all lines that have been found (default)
|
|---|
| 47 |
|
|---|
| 48 | Parameters:
|
|---|
| 49 | invert if True, only channels belong to lines will be unmasked
|
|---|
| 50 |
|
|---|
| 51 | Note: all channels originally masked by the input mask or
|
|---|
| 52 | dropped out by the edge parameter will still be excluded
|
|---|
| 53 | regardless on the invert option
|
|---|
| 54 | """
|
|---|
| [302] | 55 | return self.finder._getmask(invert)
|
|---|
| [297] | 56 | def get_ranges(self,defunits=True):
|
|---|
| 57 | """
|
|---|
| 58 | Get ranges (start and end channels or velocities) for all spectral
|
|---|
| 59 | lines found.
|
|---|
| 60 |
|
|---|
| 61 | Parameters:
|
|---|
| 62 | defunits if True (default), the range will use the same units
|
|---|
| 63 | as set for the scan (e.g. LSR velocity)
|
|---|
| 64 | if False, the range will be expressed in channels
|
|---|
| 65 | """
|
|---|
| 66 | return self.finder.getlineranges(defunits)
|
|---|
