Repository: skypyproject/skypy (python)
Issue: MAINT: Delete CAMB function
## Description
Delete extra CAMB function, any associated unit tests and references

Pull request description: MAINT: Delete CAMB function
## Description
Delete extra CAMB function, any associated unit tests and references
Merging this pull request closes #553 

## Checklist
- [x] Follow the [Contributor Guidelines](https://github.com/skypyproject/skypy/blob/main/CONTRIBUTING.rst)
- [ ] Write unit tests
- [ ] Write documentation strings
- [ ] Assign someone from your working team to review this pull request
- [ ] Assign someone from the infrastructure team to review this pull request


Patch:
diff --git a/skypy/power_spectrum/__init__.py b/skypy/power_spectrum/__init__.py
index 2269345..922b237 100644
--- a/skypy/power_spectrum/__init__.py
+++ b/skypy/power_spectrum/__init__.py
@@ -8,7 +8,7 @@ Linear Power Spectrum
    :nosignatures:
    :toctree: ../api/
 
-   camb
+   CAMB
    classy
    eisenstein_hu
    transfer_no_wiggles
@@ -48,3 +48,4 @@ from ._camb import *  # noqa F401,F403
 from ._eisenstein_hu import *  # noqa F401,F403
 from ._halofit import *  # noqa F401,F403
 from ._growth import *  # noqa F401,F403
+from ._base import * # noqa F401,F403
diff --git a/skypy/power_spectrum/_camb.py b/skypy/power_spectrum/_camb.py
index fefe01f..5f3701f 100644
--- a/skypy/power_spectrum/_camb.py
+++ b/skypy/power_spectrum/_camb.py
@@ -1,98 +1,13 @@
 import numpy as np
 from astropy import units
-from inspect import signature
 from ._base import TabulatedPowerSpectrum
 
 
 __all__ = [
     'CAMB',
-    'camb',
 ]
 
 
-def camb(wavenumber, redshift, cosmology, A_s, n_s):
-    r'''CAMB linear matter power spectrum.
-    Compute the linear matter power spectrum on a two dimensional grid of
-    redshift and wavenumber using CAMB [1]_.
-
-    Parameters
-    ----------
-    wavenumber : (nk,) array_like
-        Array of wavenumbers in units of Mpc-1 at which to
-        evaluate the linear matter power spectrum.
-    redshift : (nz,) array_like
-        Array of redshifts at which to evaluate the linear matter power
-        spectrum.
-    cosmology : astropy.cosmology.Cosmology
-        Cosmology object providing omega_matter, omega_baryon, Hubble
-        parameter and CMB temperature in the present day
-    A_s : float
-        Cosmology parameter, amplitude normalisation of curvature perturbation
-        power spectrum
-    n_s : float
-        Cosmology parameter, spectral index of scalar perturbation power
-        spectrum
-
-    Returns
-    -------
-    power_spectrum : (nz, nk) array_like
-        Array of values for the linear matter power spectrum in Mpc3
-        evaluated at the input wavenumbers for the given primordial power
-        spectrum parameters, cosmology. For nz redshifts and nk wavenumbers
-        the returned array will have shape (nz, nk).
-
-    References
-    ----------
-    .. [1] Lewis, A. and Challinor, A. and Lasenby, A. (2000),
-        doi : 10.1086/309179.
-
-    '''
-
-    try:
-        from camb import CAMBparams, model, get_matter_power_interpolator
-    except ImportError:
-        raise Exception("camb is required to use skypy.power_spectrum.camb")
-
-    return_shape = (*np.shape(redshift), *np.shape(wavenumber))
-    redshift = np.atleast_1d(redshift)
-
-    h2 = cosmology.h * cosmology.h
-
-    pars = CAMBparams()
-    pars.set_cosmology(H0=cosmology.H0.value,
-                       ombh2=cosmology.Ob0 * h2,
-                       omch2=cosmology.Odm0 * h2,
-                       omk=cosmology.Ok0,
-                       TCMB=cosmology.Tcmb0.value,
-                       mnu=np.sum(cosmology.m_nu.to_value(units.eV)),
-                       standard_neutrino_neff=cosmology.Neff
-                       )
-
-    # camb interpolator requires redshifts to be in increasing order
-    redshift_order = np.argsort(redshift)
-    wavenumber_order = np.argsort(wavenumber)
-
-    pars.InitPower.ns = n_s
-    pars.InitPower.As = A_s
-
-    pars.NonLinear = model.NonLinear_none
-
-    if len(redshift) > signature(get_matter_power_interpolator).parameters['nz_step'].default:
-        redshift_kwargs = {'zmin': np.min(redshift), 'zmax': np.max(redshift)}
-    else:
-        redshift_kwargs = {'zs': redshift}
-
-    pk_interp = get_matter_power_interpolator(pars,
-                                              nonlinear=False,
-                                              hubble_units=False, k_hunit=False,
-                                              kmax=np.max(wavenumber),
-                                              **redshift_kwargs)
-
-    pzk = pk_interp.P(redshift[redshift_order], wavenumber[wavenumber_order])
-
-    return pzk[redshift_order].reshape(return_shape)
-
-
 class CAMB(TabulatedPowerSpectrum):
 
     def __init__(self, kmax, redshift, cosmology, A_s, n_s, **kwargs):


Test patch:
diff --git a/skypy/power_spectrum/tests/data/class_result.txt b/skypy/power_spectrum/tests/data/class_result.txt
index a757352..a7d7c88 100644
--- a/skypy/power_spectrum/tests/data/class_result.txt
+++ b/skypy/power_spectrum/tests/data/class_result.txt
@@ -1,2 +1,2 @@
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1.461401776069832886e+04 1.530012587190215527e+04 1.601605361603371057e+04 1.676281141722149187e+04 1.754140968777489979e+04 1.835285471050156411e+04 1.919814258993274780e+04 2.007826789029309293e+04 2.099422517580720159e+04 2.194700397868958680e+04 2.293749637501292818e+04 2.396650617334505296e+04 2.503483399362274213e+04 2.614328045578273668e+04 2.729259429677140724e+04 2.848325299910834656e+04 2.971564569218039469e+04 3.099016145726011018e+04 3.230718663595217004e+04 3.366686606780228612e+04 3.506891752657855977e+04 3.651301510933019745e+04 3.799883291310634377e+04 3.952599173980314663e+04 4.109347187926741026e+04 4.269983021441728488e+04 4.434361609991840669e+04 4.602337888221160392e+04 4.773735819384234492e+04 4.948266387547630438e+04 5.125614822379151155e+04 5.305466353546595928e+04 5.487503947816657455e+04 5.671324621678657422e+04 5.856414893918840244e+04 6.042254013598637539e+04 6.228321229779491841e+04 6.414073675795610325e+04 6.598792490647920931e+04 6.781674740951151762e+04 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diff --git a/skypy/power_spectrum/tests/test_base.py b/skypy/power_spectrum/tests/test_base.py
new file mode 100644
index 0000000..500f3de
--- /dev/null
+++ b/skypy/power_spectrum/tests/test_base.py
@@ -0,0 +1,21 @@
+import numpy as np
+
+
+def test_TabulatedPowerSpectrum():
+    from skypy.power_spectrum import TabulatedPowerSpectrum
+
+    def power_spectrum_dummy(wavenumber, redshift):
+        # returns log10 power spectrum on redshift wavelength grid -> 2D
+        return 0.4*redshift[:, np.newaxis] + 0.2*np.log10(wavenumber) + 2
+
+    wavenumber = np.linspace(800, 9000, 100)
+    redshift = np.linspace(0, 3, 50)
+    power_spectrum = np.power(10, power_spectrum_dummy(wavenumber, redshift))
+    tab_power_spectrum = TabulatedPowerSpectrum(wavenumber, redshift, power_spectrum)
+
+    wavenumber_test = np.linspace(1100, 7000, 100)
+    redshift_test = np.linspace(1, 2, 50)
+    interp_power = tab_power_spectrum(wavenumber_test, redshift_test)
+    power_spectrum_test = np.power(10, power_spectrum_dummy(wavenumber_test, redshift_test))
+
+    assert np.allclose(interp_power, power_spectrum_test)
diff --git a/skypy/power_spectrum/tests/test_camb.py b/skypy/power_spectrum/tests/test_camb.py
index fc2762c..84ffadf 100644
--- a/skypy/power_spectrum/tests/test_camb.py
+++ b/skypy/power_spectrum/tests/test_camb.py
@@ -60,28 +60,3 @@ def test_camb_redshift_zero():
     wavenumber = np.logspace(-4.0, np.log10(2.0), 200)
     pzk = ps(wavenumber, redshift)
     assert allclose(pzk, test_pzk[0], rtol=1.e-4)
-
-
-@pytest.mark.skipif(CAMB_NOT_FOUND, reason='CAMB not found')
-def test_camb_interpolation():
-    from camb import get_matter_power_interpolator
-    from inspect import signature
-    from skypy.power_spectrum import camb
-
-    # Number of redshifts above which CAMB will do interpolation
-    nz_step = signature(get_matter_power_interpolator).parameters['nz_step'].default
-
-    # Two redshift arrays. For the first CAMB will calculate the exact power
-    # spectrum. The second contains all of the redshifts from the first as a
-    # subset, but CAMB will calculate the power spectrum using interpolation.
-    z_exact = np.linspace(0, 1, nz_step)
-    z_interp = np.linspace(0, 1, 2*nz_step - 1)
-
-    # Exact power spectrum
-    wavenumber = np.logspace(-3.0, 1, 100)
-    A_s, n_s = 2.2E-9, 0.97
-    p_exact = camb(wavenumber, z_exact, Planck15, A_s, n_s)
-
-    # Interpolated power spectrum at the same redshifts
-    p_interp = camb(wavenumber, z_interp, Planck15, A_s, n_s)[::2]
-    assert allclose(p_exact, p_interp)
diff --git a/skypy/power_spectrum/tests/test_class.py b/skypy/power_spectrum/tests/test_class.py
index f83e164..b7014bf 100644
--- a/skypy/power_spectrum/tests/test_class.py
+++ b/skypy/power_spectrum/tests/test_class.py
@@ -12,13 +12,12 @@ test_pzk = np.loadtxt(class_result_filename)
 # try to import the requirement, if it doesn't exist, skip test
 try:
     __import__('classy')
+    CLASS_294_NOT_FOUND = __import__('classy').__version__ != 'v2.9.4'
 except ImportError:
-    CLASS_NOT_FOUND = True
-else:
-    CLASS_NOT_FOUND = False
+    CLASS_294_NOT_FOUND = True
 
 
-@pytest.mark.skipif(CLASS_NOT_FOUND, reason='classy not found')
+@pytest.mark.skipif(CLASS_294_NOT_FOUND, reason='classy v2.9.4 not found')
 def test_classy():
     '''
     Test a default astropy cosmology