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Individual contributions to the freq-freq cross #31

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24 changes: 24 additions & 0 deletions fgspectra/cross.py
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,30 @@ def eval(self, sed_kwargs={}, cl_kwargs={}):
f_nu = self._sed(**sed_kwargs)
return np.einsum('k...i,n...j,...knl->...ijl',
f_nu, f_nu, self._cl(**cl_kwargs))

def eval_terms(self, sed_kwargs={}, cl_kwargs={}):
"""Compute the comp-comp contribution to the cross

The summation of this tensor over the components dimensions gives
the freq-freq cross spectrum (i.e. the result of `eval`

Parameters
----------
sed_args : list
Arguments for which the `sed` is evaluated.
cl_args : list
Arguments for which the `cl` is evaluated.

Returns
-------
cross : ndarray
Cross-spectrum.
The shape is ``(..., comp, comp, freq, freq, ell)``.
"""

f_nu = self._sed(**sed_kwargs)
return np.einsum('k...i,n...j,...knl->...knijl',
f_nu, f_nu, self._cl(**cl_kwargs))


class PowerLaw(FactorizedCrossSpectrum):
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