| 1 | from asap._asap import sdreader |
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| 2 | |
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| 3 | class reader(sdreader): |
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| 4 | """ |
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| 5 | This class allows the user to import single dish files |
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| 6 | (rpfits,sdfits,ms). |
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| 7 | The reader reads in integrations from the file and reamins at |
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| 8 | the fileposition afterwards. |
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| 9 | Available functions are: |
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| 10 | |
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| 11 | read(integrations) |
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| 12 | summary CURRENTLY DISABLED |
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| 13 | |
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| 14 | Example: |
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| 15 | r = reader('/tmp/P389.rpf') |
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| 16 | scans r.read() # reads in the complete file into 'scans' |
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| 17 | print scans # summarises the contents |
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| 18 | del r # destroys the reader |
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| 19 | """ |
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| 20 | |
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| 21 | def __init__(self, filename, unit=None, theif=None, thebeam=None): |
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| 22 | self.unit = unit |
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| 23 | """ |
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| 24 | Parameters: |
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| 25 | filename: the name of an rpfits/sdfits/ms file on disk |
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| 26 | unit: brightness unit; must be consistent with K or Jy. |
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| 27 | The default is that a unit is set depending on |
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| 28 | the telescope. Setting this over-rides that choice. |
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| 29 | theif: select a specific IF (default is all) |
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| 30 | thebeam: select a specific beam (default is all) |
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| 31 | Example: |
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| 32 | r = reader('/tmp/2001-09-01_0332_P363.rpf', theif=2) |
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| 33 | """ |
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| 34 | if theif is None: |
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| 35 | theif = -1 |
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| 36 | if thebeam is None: |
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| 37 | thebeam = -1 |
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| 38 | sdreader.__init__(self, filename, theif, thebeam) |
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| 39 | |
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| 40 | def read(self,integrations=None): |
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| 41 | """ |
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| 42 | Reads in an returns a specified sequence of integrations. |
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| 43 | If no list is given all integrations a read in. |
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| 44 | Parameters: |
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| 45 | integrations: a 'range' of integration numbers, e.g. |
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| 46 | range(100) or [0,1,2,3,4,10,11,100] |
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| 47 | If not given (default) all integrations |
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| 48 | are read in |
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| 49 | Example: |
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| 50 | r.read([0,1,2,3,4]) # reads in the first 5 integatrions |
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| 51 | # NOT scans |
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| 52 | r.read(range(100)) # read in the first 100 integrations |
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| 53 | """ |
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| 54 | from asap import scantable |
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| 55 | if integrations is None: |
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| 56 | integrations = [-1] |
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| 57 | print "Reading integrations from disk..." |
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| 58 | sdreader._read(self,integrations) |
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| 59 | tbl = sdreader._getdata(self) |
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| 60 | if self.unit is not None: |
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| 61 | tbl.set_fluxunit(self.unit) |
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| 62 | return scantable(tbl) |
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| 63 | |
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| 64 | def summary(self): |
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| 65 | """ |
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| 66 | Print a summary of all scans/integrations. This reads through the |
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| 67 | whole file once. |
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| 68 | Parameters: |
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| 69 | None |
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| 70 | Example: |
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| 71 | r.summary() |
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| 72 | """ |
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| 73 | sdreader._reset(self) |
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| 74 | sdreader._read(self,[-1]) |
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| 75 | tbl = sdreader._getdata(self) |
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| 76 | sdreader._reset(self) |
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| 77 | print tbl._summary() |
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| 78 | return |
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| 79 | def reset(self): |
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| 80 | """ |
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| 81 | Reset to the beginning of the file. |
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| 82 | Parameters: |
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| 83 | none |
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| 84 | Examples: |
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| 85 | r = reader('xyz.sdfits') |
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| 86 | scans0 = r.read(range(10)) |
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| 87 | r.reset() |
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| 88 | scans1 = r.read(range(5,15)) |
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| 89 | # produces 2 scatables one containing integrations(rows) 0-9 |
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| 90 | # and a second one with rows 5-14 |
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| 91 | sdreader._reset(self) |
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| 92 | |
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