From 90e7dcd17f264e22dc4f2e9f53ba82d3c292e42a Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Fri, 9 May 2025 07:44:48 -0300
Subject: Don't use negative values to compute the energy

---
 log-fourier.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/log-fourier.cpp b/log-fourier.cpp
index 5b5955a..e8404d7 100644
--- a/log-fourier.cpp
+++ b/log-fourier.cpp
@@ -186,6 +186,7 @@ Real estimateZ(LogarithmicFourierTransform& fft, const std::vector<Real>& C, con
 Real energy(const LogarithmicFourierTransform& fft, std::vector<Real>&  C, const std::vector<Real>& R, unsigned p, unsigned s, Real λ, Real β) {
   Real E = fft.t(0) * (df(λ, p, s, 1) + R[0] * df(λ, p, s, C[0])) / 2;
   for (unsigned n = 0; n < C.size()/2-1; n++) {
+    if (C[2*n+2] < 0 || R[2*n+2] < 0) break;
     Real h₂ₙ   = fft.t(2*n+1) - fft.t(2*n);
     Real h₂ₙ₊₁ = fft.t(2*n+2) - fft.t(2*n+1);
     Real f₂ₙ   = R[2*n]   * df(λ, p, s, C[2*n]);
-- 
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