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MAINT: rename next --> i_next #158

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Mar 7, 2023
Merged

MAINT: rename next --> i_next #158

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18 changes: 9 additions & 9 deletions refl1d/lib_numba/reflectivity.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
_REFL_SIG = 'c16(i8, f8, f8[:], f8[:], f8[:], f8[:])'
_REFL_LOCALS = {
"cutoff": numba.float64,
"next": numba.int64,
"i_next": numba.int64,
"sigma_offset": numba.int64,
"step": numba.int8,
"pi4": numba.float64,
Expand Down Expand Up @@ -32,10 +32,10 @@ def refl(layers, kz, depth, sigma, rho, irho):
cutoff = 1e-10
sigma_offset = 0
if (kz >= cutoff):
next = 0
i_next = 0
step = 1
elif (kz <= -cutoff):
next = layers-1
i_next = layers-1
step = -1
sigma_offset = -1
else:
Expand All @@ -44,7 +44,7 @@ def refl(layers, kz, depth, sigma, rho, irho):
# // Since sqrt(1/4 * x) = sqrt(x)/2, I'm going to pull the 1/2 into the
# // sqrt to save a multiplication later.
pi4 = 12.566370614359172e-6 # // 1e-6 * 4 pi
kz_sq = kz*kz + pi4*rho[next] # // kz^2 + 4 pi Vrho
kz_sq = kz*kz + pi4*rho[i_next] # // kz^2 + 4 pi Vrho
k = fabs(kz)

B11 = B22 = 1
Expand All @@ -54,10 +54,10 @@ def refl(layers, kz, depth, sigma, rho, irho):
# // The loop index is not the layer number because we may be reversing
# // the stack. Instead, n is set to the incident layer (which may be
# // first or last) and incremented or decremented each time through.
k_next = sqrt(kz_sq - pi4*complex(rho[next+step], irho[next+step]))
F = (k-k_next)/(k+k_next)*exp(-2.*k*k_next * sigma[sigma_offset + next]**2)
M11 = exp(J*k*depth[next]) if i > 0 else 1.0
M22 = exp(-J*k*depth[next]) if i > 0 else 1.0
k_next = sqrt(kz_sq - pi4*complex(rho[i_next+step], irho[i_next+step]))
F = (k-k_next)/(k+k_next)*exp(-2.*k*k_next * sigma[sigma_offset + i_next]**2)
M11 = exp(J*k*depth[i_next]) if i > 0 else 1.0
M22 = exp(-J*k*depth[i_next]) if i > 0 else 1.0
M21 = F*M11
M12 = F*M22

Expand All @@ -71,7 +71,7 @@ def refl(layers, kz, depth, sigma, rho, irho):
C2 = B12*M21 + B22*M22
B12 = C1
B22 = C2
next += step
i_next += step
k = k_next

# // And we are done.
Expand Down