[103] | 1 | from asap._asap import sdreader |
---|
| 2 | |
---|
| 3 | class reader(sdreader): |
---|
| 4 | """ |
---|
| 5 | This class allows the user to import single dish files |
---|
| 6 | (rpfits,sdfits,ms). |
---|
[113] | 7 | The reader reads in integrations from the file and reamins at |
---|
| 8 | the fileposition afterwards. |
---|
[103] | 9 | Available functions are: |
---|
| 10 | |
---|
| 11 | read(integrations) |
---|
| 12 | summary CURRENTLY DISABLED |
---|
| 13 | |
---|
| 14 | Example: |
---|
| 15 | r = reader('/tmp/P389.rpf') |
---|
| 16 | scans r.read() # reads in the complete file into 'scans' |
---|
| 17 | print scans # summarises the contents |
---|
| 18 | del r # destroys the reader |
---|
[415] | 19 | |
---|
| 20 | IMPORTANT: Due to limitations in the rpfits library, only one reader |
---|
| 21 | can be created at a time. |
---|
| 22 | r = reader('XYZ.rpf') |
---|
| 23 | r2 = reader('ABC.rpf') |
---|
| 24 | is NOT possible. This is a limitation affecting |
---|
| 25 | rpfits ONLY. |
---|
[103] | 26 | """ |
---|
| 27 | |
---|
[341] | 28 | def __init__(self, filename, unit=None, theif=None, thebeam=None): |
---|
| 29 | self.unit = unit |
---|
[103] | 30 | """ |
---|
| 31 | Parameters: |
---|
| 32 | filename: the name of an rpfits/sdfits/ms file on disk |
---|
[339] | 33 | unit: brightness unit; must be consistent with K or Jy. |
---|
| 34 | The default is that a unit is set depending on |
---|
| 35 | the telescope. Setting this over-rides that choice. |
---|
[333] | 36 | theif: select a specific IF (default is all) |
---|
| 37 | thebeam: select a specific beam (default is all) |
---|
[103] | 38 | Example: |
---|
[333] | 39 | r = reader('/tmp/2001-09-01_0332_P363.rpf', theif=2) |
---|
[103] | 40 | """ |
---|
[333] | 41 | if theif is None: |
---|
| 42 | theif = -1 |
---|
| 43 | if thebeam is None: |
---|
| 44 | thebeam = -1 |
---|
[411] | 45 | from os.path import expandvars |
---|
| 46 | filename = expandvars(filename) |
---|
[341] | 47 | sdreader.__init__(self, filename, theif, thebeam) |
---|
[103] | 48 | |
---|
| 49 | def read(self,integrations=None): |
---|
| 50 | """ |
---|
| 51 | Reads in an returns a specified sequence of integrations. |
---|
| 52 | If no list is given all integrations a read in. |
---|
| 53 | Parameters: |
---|
| 54 | integrations: a 'range' of integration numbers, e.g. |
---|
| 55 | range(100) or [0,1,2,3,4,10,11,100] |
---|
[113] | 56 | If not given (default) all integrations |
---|
| 57 | are read in |
---|
[103] | 58 | Example: |
---|
| 59 | r.read([0,1,2,3,4]) # reads in the first 5 integatrions |
---|
| 60 | # NOT scans |
---|
| 61 | r.read(range(100)) # read in the first 100 integrations |
---|
| 62 | """ |
---|
| 63 | from asap import scantable |
---|
| 64 | if integrations is None: |
---|
| 65 | integrations = [-1] |
---|
[127] | 66 | print "Reading integrations from disk..." |
---|
[406] | 67 | sdreader._read(self,integrations) |
---|
| 68 | tbl = sdreader._getdata(self) |
---|
[409] | 69 | sdreader._reset(self) # reset to the beginning of the file |
---|
[341] | 70 | if self.unit is not None: |
---|
| 71 | tbl.set_fluxunit(self.unit) |
---|
[103] | 72 | return scantable(tbl) |
---|
| 73 | |
---|
[411] | 74 | def summary(self, name=None): |
---|
[113] | 75 | """ |
---|
| 76 | Print a summary of all scans/integrations. This reads through the |
---|
| 77 | whole file once. |
---|
| 78 | Parameters: |
---|
| 79 | None |
---|
| 80 | Example: |
---|
| 81 | r.summary() |
---|
| 82 | """ |
---|
[406] | 83 | sdreader._reset(self) |
---|
| 84 | sdreader._read(self,[-1]) |
---|
[411] | 85 | from asap import scantable |
---|
| 86 | tbl = scantable(sdreader._getdata(self)) |
---|
[406] | 87 | sdreader._reset(self) |
---|
[415] | 88 | tbl.summary(name) |
---|
[113] | 89 | return |
---|
[409] | 90 | ## def reset(self): |
---|
| 91 | ## """ |
---|
| 92 | ## [Advanced use] |
---|
| 93 | ## Reset to the beginning of the file. |
---|
| 94 | ## Parameters: |
---|
| 95 | ## none |
---|
| 96 | ## Examples: |
---|
| 97 | ## r = reader('xyz.sdfits') |
---|
| 98 | ## scans0 = r.read(range(10)) |
---|
| 99 | ## r.reset() |
---|
| 100 | ## scans1 = r.read(range(5,15)) |
---|
| 101 | ## # produces 2 scatables one containing integrations(rows) 0-9 |
---|
| 102 | ## # and a second one with rows 5-14 |
---|
| 103 | ## """ |
---|
| 104 | ## sdreader._reset(self) |
---|
[406] | 105 | |
---|