PEP8 fixes

lambdas and coverage

amodem/dsp.py

@@ -72,6 +72,10 @@ def norm(x):
     return np.sqrt(np.dot(x.conj(), x).real)
 
 
+def rms(x):
+    return np.mean(np.abs(x) ** 2, axis=0) ** 0.5
+
+
 def coherence(x, omega):
     n = len(x)
     Hc = exp_iwt(-omega, n) / np.sqrt(0.5*n)

amodem/recv.py

@@ -79,10 +79,9 @@ class Receiver(object):
         error_rate = errors.sum() / errors.size
 
         errors = np.array(symbols - train_symbols)
-        rms = lambda x: (np.mean(np.abs(x) ** 2, axis=0) ** 0.5)
 
-        noise_rms = rms(errors)
+        noise_rms = dsp.rms(errors)
-        signal_rms = rms(train_symbols)
+        signal_rms = dsp.rms(train_symbols)
         SNRs = 20.0 * np.log10(signal_rms / noise_rms)
 
         self.plt.figure()

tests/test_common.py

@@ -1,4 +1,5 @@
 from amodem import common
+from amodem import config
 import numpy as np
 
 
@@ -59,3 +60,11 @@ def test_holder():
     assert a.x == d['x']
     assert a.y == d['y']
     assert repr(a) == 'AttributeHolder(x=1, y=2.3)'
+
+
+def test_configs():
+    default = config.Configuration()
+    fastest = config.fastest()
+    slowest = config.slowest()
+    assert slowest.modem_bps <= default.modem_bps
+    assert fastest.modem_bps >= default.modem_bps

tests/test_dsp.py

@@ -48,7 +48,9 @@ def test_qam():
     decoded = list(q.decode(S))
     assert decoded == bits
 
-    noise = lambda A: A*(r.uniform(-1, 1) + 1j*r.uniform(-1, 1))
+    def noise(A):
+        return A*(r.uniform(-1, 1) + 1j*r.uniform(-1, 1))
+
     noised_symbols = [(s + noise(1e-3)) for s in S]
     decoded = list(q.decode(noised_symbols))
     assert decoded == bits