Fixed usages of x, x_hat, y

sw/utility/codes.py

@@ -13,7 +13,7 @@ import numpy as np
 
 def _parse_alist_header(header):
     size = header.split()
-    return int(size[0,]), int(size[1])
+    return int(size[0]), int(size[1])
 
 
 def read_alist_file(filename):

sw/utility/simulations.py

@@ -54,9 +54,9 @@ def test_decoder(x: np.array,
 
             y = noise.add_awgn(x_bpsk, SNR, signal_amp=np.sqrt(2))
 
-            y_hat = decoder.decode(y)
+            x_hat = decoder.decode(y)
 
-            total_bit_errors += count_bit_errors(x, y_hat)
+            total_bit_errors += count_bit_errors(x, x_hat)
             total_bits += x.size
 
             if total_bit_errors >= target_bit_errors: