1 | asap0000 |
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2 | ======== |
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3 | Hi |
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4 | |
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5 | Jim Lovell has discovered a strange corruption bug in asap. |
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6 | |
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7 | When we run: |
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8 | |
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9 | scans = scantable('2005-03-09_172811_t002.rpf') |
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10 | scans.summary(verbose=True) |
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11 | |
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12 | repeatably the source position become corrupted (generally it seems to be |
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13 | after the third "scantable" construction. |
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14 | |
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15 | The above data is in /DATA/VULCAN_1/cphillip/vulcan/data/asap, but I think |
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16 | any data will do. |
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17 | |
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18 | Cheers |
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19 | Chris |
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20 | |
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21 | |
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22 | --------------------------------------------------------- |
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23 | **OK |
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24 | |
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25 | ASAP> scans.summary(verbose=True) |
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26 | |
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27 | -------------------------------------------------------------------------------- |
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28 | Scan Table Summary |
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29 | -------------------------------------------------------------------------------- |
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30 | Beams: 1 |
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31 | IFs: 2 |
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32 | Polarisations: 1 |
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33 | Channels: 4096 |
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34 | |
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35 | Observer: Auto_Spec |
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36 | Obs Date: 2005/03/09/17:29:22 |
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37 | Project: NGC6334Fw |
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38 | Obs. Type: |
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39 | Antenna Name: DSS-43 |
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40 | Flux Unit: K |
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41 | Rest Freqs: [2.39639e+10] [Hz] |
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42 | Abcissa: Channel |
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43 | Cursor: Beam[0] IF[0] Pol[0] |
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44 | |
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45 | Scan Source Position (J2000) Time Integration |
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46 | FreqIDs |
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47 | -------------------------------------------------------------------------------- |
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48 | 0 NGC6334Fw 17:18:23.4 -35.47.01.3 17:30:37 1 x 02:31.0 |
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49 | [0, 1] [0] |
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50 | 1 NGC6334F 17:20:53.4 -35.47.01.3 17:33:43 1 x 02:33.9 |
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51 | [0, 1] [0] |
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52 | 2 NGC6334F 17:20:53.4 -35.47.01.3 17:36:34 1 x 02:33.9 |
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53 | [2, 3] [0] |
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54 | 3 NGC6334Fe 17:23:23.4 -35.47.01.3 17:39:40 1 x 02:33.9 |
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55 | [2, 3] [0] |
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56 | 4 NGC6334Fw 17:18:23.4 -35.47.01.3 17:42:11 1 x 01:22.9 |
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57 | [4, 5] [0] |
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58 | |
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59 | Table contains 5 integration(s) in 5 scan(s). |
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60 | |
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61 | |
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62 | FreqID Frame RefFreq(Hz) RefPix Increment(Hz) |
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63 | -------------------------------------------------------------------------------- |
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64 | 0 TOPO 2.396822e+10 2048 3906.25 |
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65 | 1 TOPO 2.4143763e+10 2048 3906.25 |
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66 | 2 TOPO 2.3968219e+10 2048 3906.25 |
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67 | 3 TOPO 2.4143763e+10 2048 3906.25 |
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68 | 4 TOPO 2.3968219e+10 2048 3906.25 |
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69 | 5 TOPO 2.4143762e+10 2048 3906.25 |
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70 | -------------------------------------------------------------------------------- |
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71 | |
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72 | |
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73 | **BAD |
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74 | |
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75 | ASAP> scans = scantable('2005-03-09_172811_t002.rpf') |
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76 | Importing data... |
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77 | Auto averaging integrations... |
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78 | Weighting type selected : None |
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79 | |
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80 | ASAP> scans.summary(verbose=True) |
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81 | |
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82 | -------------------------------------------------------------------------------- |
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83 | Scan Table Summary |
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84 | -------------------------------------------------------------------------------- |
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85 | Beams: 1 |
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86 | IFs: 2 |
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87 | Polarisations: 1 |
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88 | Channels: 4096 |
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89 | |
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90 | Observer: Auto_Spec |
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91 | Obs Date: 2005/03/09/17:29:22 |
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92 | Project: NGC6334Fw |
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93 | Obs. Type: |
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94 | Antenna Name: DSS-43 |
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95 | Flux Unit: K |
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96 | Rest Freqs: [2.39639e+10] [Hz] |
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97 | Abcissa: Channel |
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98 | Cursor: Beam[0] IF[0] Pol[0] |
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99 | |
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100 | Scan Source Position (J2000) Time Integration |
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101 | FreqIDs |
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102 | -------------------------------------------------------------------------------- |
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103 | 0 NGC6334Fw 17:47:49.9 +16.00.27.6 17:30:37 1 x 02:31.0 |
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104 | [0, 1] [0] |
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105 | 1 NGC6334F 17:03:08.2 -44.33.03.4 17:33:43 1 x 02:33.9 |
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106 | [0, 1] [0] |
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107 | 2 NGC6334F 03:46:52.4 +56.43.05.6 17:36:34 1 x 02:33.9 |
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108 | [2, 3] [0] |
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109 | 3 NGC6334Fe 17:47:49.9 +16.00.27.6 17:39:40 1 x 02:33.9 |
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110 | [2, 3] [0] |
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111 | 4 NGC6334Fw 17:03:08.2 -44.33.03.4 17:42:11 1 x 01:22.9 |
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112 | [4, 5] [0] |
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113 | |
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114 | Table contains 5 integration(s) in 5 scan(s). |
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115 | |
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116 | |
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117 | FreqID Frame RefFreq(Hz) RefPix Increment(Hz) |
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118 | -------------------------------------------------------------------------------- |
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119 | 0 TOPO 2.396822e+10 2048 3906.25 |
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120 | 1 TOPO 2.4143763e+10 2048 3906.25 |
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121 | 2 TOPO 2.3968219e+10 2048 3906.25 |
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122 | 3 TOPO 2.4143763e+10 2048 3906.25 |
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123 | 4 TOPO 2.3968219e+10 2048 3906.25 |
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124 | 5 TOPO 2.4143762e+10 2048 3906.25 |
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125 | -------------------------------------------------------------------------------- |
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126 | |
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127 | |
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128 | Seems to be a good old rpfits (fortran) memory problem. |
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129 | |
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130 | repeatedly opening an rpfits file with the read buggers up the refbeam field. |
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131 | as the summary function looks at the refbeam to determine the positions it |
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132 | fails as the reader returns a "random" value. |
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133 | |
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134 | I have a chat to Mark. |
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135 | |
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136 | Malte. |
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137 | |
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138 | Mark, |
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139 | |
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140 | The attached data has only one beam. |
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141 | This only occurs on this data set. |
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142 | If I convert it to sdfits the problem is solved as you don't write this column |
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143 | out unless it is MX data. |
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144 | For now I have put a kludge in, which checks nBeam >1 and only then gets the |
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145 | refbeam from the data. |
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