def test_iter_isinstance():
obj = (1, 'x', 2.5)
assert cu.iter_isinstance(obj, (int, str, float))
assert cu.iter_isinstance(obj, ((int, float), (str, int), float))
assert not cu.iter_isinstance(obj, (int, str))
assert not cu.iter_isinstance(obj, (int, str, float, int))
assert not cu.iter_isinstance(1, (int)) # only works for tuples
assert not cu.iter_isinstance(int, (float))
assert cu.iter_isinstance(obj, (int, str), (int, str, float), (float, int))
def test_iter_isinstance():
obj = (1, 'x', 2.5)
assert cu.iter_isinstance(obj, (int, str, float))
assert cu.iter_isinstance(obj, ((int, float), (str, int), float))
assert not cu.iter_isinstance(obj, (int, str))
assert not cu.iter_isinstance(obj, (int, str, float, int))
assert not cu.iter_isinstance(1, (int)) # only works for tuples
assert not cu.iter_isinstance(int, (float))
assert cu.iter_isinstance(obj, (int, str), (int, str, float), (float, int))
def slice_to_cube(self, axis, chunk, **kwargs):
"""
For a hypercube, return a 3-D cube that has been cut along the given
axis and with data corresponding to the given chunk.
Parameters
----------
axis: int
The axis to cut from the hypercube
chunk: int, astropy Quantity or tuple:
The data to take from the axis
"""
if self.data.ndim == 3:
raise cu.CubeError(4, 'Can only slice a hypercube into a cube')
item = [slice(None, None, None) for _ in range(4)]
if isinstance(chunk, tuple):
if cu.iter_isinstance(chunk, (u.Quantity, u.Quantity)):
pixel0 = cu.convert_point(chunk[0].value, chunk[0].unit,
self.axes_wcs, axis)
pixel1 = cu.convert_point(chunk[1].value, chunk[1].unit,
self.axes_wcs, axis)
item[axis] = slice(pixel0, pixel1, None)
elif cu.iter_isinstance((chunk, int, int)):
item[axis] = slice(chunk[0], chunk[1], None)
else:
raise cu.CubeError(5, "Parameters must be of the same type")
newdata = self.data[item].sum(axis)
else:
unit = chunk.unit if isinstance(chunk, u.Quantity) else None
pixel = cu.convert_point(chunk, unit, self.axes_wcs, axis)
item[axis] = pixel
newdata = self.data[item]
wcs_indices = [0, 1, 2, 3]
wcs_indices.remove(3 - axis)
newwcs = wu.reindex_wcs(self.axes_wcs, np.array(wcs_indices))
if axis == 2 or axis == 3:
newwcs = wu.add_celestial_axis(newwcs)
newwcs.was_augmented = True
cube = Cube(newdata, newwcs, meta=self.meta, **kwargs)
return cube
def slice_to_cube(self, axis, chunk, **kwargs):
"""
For a hypercube, return a 3-D cube that has been cut along the given
axis and with data corresponding to the given chunk.
Parameters
----------
axis: int
The axis to cut from the hypercube
chunk: int, astropy Quantity or tuple:
The data to take from the axis
"""
if self.data.ndim == 3:
raise cu.CubeError(4, 'Can only slice a hypercube into a cube')
item = [slice(None, None, None) for _ in range(4)]
if isinstance(chunk, tuple):
if cu.iter_isinstance(chunk, (u.Quantity, u.Quantity)):
pixel0 = cu.convert_point(chunk[0].value, chunk[0].unit,
self.axes_wcs, axis)
pixel1 = cu.convert_point(chunk[1].value, chunk[1].unit,
self.axes_wcs, axis)
item[axis] = slice(pixel0, pixel1, None)
elif cu.iter_isinstance((chunk, int, int)):
item[axis] = slice(chunk[0], chunk[1], None)
else:
raise cu.CubeError(5, "Parameters must be of the same type")
newdata = self.data[item].sum(axis)
else:
unit = chunk.unit if isinstance(chunk, u.Quantity) else None
pixel = cu.convert_point(chunk, unit, self.axes_wcs, axis)
item[axis] = pixel
newdata = self.data[item]
wcs_indices = [0, 1, 2, 3]
wcs_indices.remove(3 - axis)
newwcs = wu.reindex_wcs(self.axes_wcs, np.array(wcs_indices))
if axis == 2 or axis == 3:
newwcs = wu.add_celestial_axis(newwcs)
newwcs.was_augmented = True
cube = Cube(newdata, newwcs, meta=self.meta, **kwargs)
return cube
def __getitem__(self, item):
if item is None or (isinstance(item, tuple) and None in item):
raise IndexError("None indices not supported")
if isinstance(item, tuple) and len(item) > 2:
spectral_slice = item[2]
else:
spectral_slice = slice(None, None, None)
if isinstance(item, int):
pixels = cu.pixelize_slice(item, self.wcs, _source='other')
else:
pixels = cu.pixelize_slice(item[:2], self.wcs, _source='other')
if cu.iter_isinstance(pixels, (int, int)):
return self.spectra[pixels][spectral_slice]
else:
newspectra = self.spectra[item]
for i in newspectra.shape[0]:
for j in newspectra.shape[1]:
spec = newspectra[i, j]
newspectra[i, j] = spec[spectral_slice]
def __getitem__(self, item):
if item is None or (isinstance(item, tuple) and None in item):
raise IndexError("None indices not supported")
if isinstance(item, tuple) and len(item) > 2:
spectral_slice = item[2]
else:
spectral_slice = slice(None, None, None)
if isinstance(item, int):
pixels = cu.pixelize_slice(item, self.wcs, _source='other')
else:
pixels = cu.pixelize_slice(item[:2], self.wcs, _source='other')
if cu.iter_isinstance(pixels, (int, int)):
return self.spectra[pixels][spectral_slice]
else:
newspectra = self.spectra[item]
for i in newspectra.shape[0]:
for j in newspectra.shape[1]:
spec = newspectra[i, j]
newspectra[i, j] = spec[spectral_slice]