now exporting the linear part of the amplitude operator

nifty5/__init__.py

@@ -74,7 +74,7 @@ from .minimization.metric_gaussian_kl import MetricGaussianKL
 from .sugar import *
 from .plot import Plot
 
-from .library.smooth_linear_amplitude import SLAmplitude, CepstrumOperator
+from .library.smooth_linear_amplitude import SLAmplitude, LinearSLAmplitude, CepstrumOperator
 from .library.inverse_gamma_operator import InverseGammaOperator
 from .library.los_response import LOSResponse
 from .library.dynamic_operator import (dynamic_operator,

nifty5/library/smooth_linear_amplitude.py

@@ -111,7 +111,6 @@ def CepstrumOperator(target, a, k0):
 
     return sym @ qht @ makeOp(cepstrum.sqrt())
 
-
 def SLAmplitude(*, target, n_pix, a, k0, sm, sv, im, iv, keys=['tau', 'phi']):
     '''Operator for parametrizing smooth amplitudes (square roots of power
     spectra).
@@ -169,6 +168,16 @@ def SLAmplitude(*, target, n_pix, a, k0, sm, sv, im, iv, keys=['tau', 'phi']):
         which returns on its target a power spectrum which consists out of a
         smooth and a linear part.
     '''
+    return LinearSLAmplitude(target, n_pix, a, k0, sm, sv, im, iv, keys).exp()
+
+
+def LinearSLAmplitude(*, target, n_pix, a, k0, sm, sv, im, iv, keys=['tau', 'phi']):
+    '''LinearOperator for parametrizing smooth log-amplitudes (square roots of power
+    spectra).
+    
+    Logarithm of SLAmplitude
+    See documentation of SLAmplitude for more details
+    '''
     if not (isinstance(n_pix, int) and isinstance(target, PowerSpace)):
         raise TypeError
 
@@ -196,4 +205,4 @@ def SLAmplitude(*, target, n_pix, a, k0, sm, sv, im, iv, keys=['tau', 'phi']):
     loglog_ampl = 0.5*(smooth + linear)
 
     # Go from loglog-space to linear-linear-space
-    return et @ loglog_ampl.exp()
+    return et @ loglog_ampl