Last change
on this file since 2740 was 1697, checked in by Malte Marquarding, 15 years ago |
Some minor tidy up and documentation
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File size:
652 bytes
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1 | from asap._asap import coordinate as _coordinate
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2 |
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3 | class coordinate(_coordinate):
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4 | """Representation of the spectral coordinate of the data (frequency axis).
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5 | """
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6 | def to_frequency(self, pixel, unit='Hz'):
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7 | """
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8 | Convert a channel/pixel value to a frequency.
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9 | """
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10 | umap = {'GHz': 1.e9, 'MHz' : 1.e6, 'kHz': 1.e3, 'Hz': 1. }
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11 | return _coordinate.to_frequency(self, pixel)/umap[unit]
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12 |
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13 |
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14 | def to_velocity(self, pixel, unit='km/s'):
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15 | """
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16 | Convert a channel/pixel value to a velocity.
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17 | """
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18 | umap = {'km/s': 1, 'm/s': 1e-3}
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19 | return _coordinate.to_velocity(self, pixel)/umap[unit]
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