nolitsa.patch

diff --git a/nolitsa/surrogates.py b/nolitsa/surrogates.py
index 584e5e6..1a7d7c6 100644
--- a/nolitsa/surrogates.py
+++ b/nolitsa/surrogates.py
@@ -142,6 +142,9 @@ def iaaft(x, maxiter=1000, atol=1e-8, rtol=1e-10):
     t = np.fft.rfft(np.random.permutation(x))
 
     for i in range(maxiter):
+        # Assure no zeroes.
+        t = np.where(t != 0, t, np.finfo(t.dtype).eps)
+
         # Match power spectrum.
         s = np.real(np.fft.irfft(ampl * t / np.abs(t), n=len(x)))
 
@@ -158,7 +161,7 @@ def iaaft(x, maxiter=1000, atol=1e-8, rtol=1e-10):
             perr = cerr
 
     # Normalize error w.r.t. mean of the "true" power spectrum.
-    return y, i, cerr / np.mean(ampl ** 2)
+    return y  # , i, cerr / np.mean(ampl ** 2)
 
 
 def mismatch(x, length=None, weight=0.5, neigh=3):