From a751a5c67e33ad07252e4c79705ea75adde772ff Mon Sep 17 00:00:00 2001
From: Nicolas Mellado <nmellado0@gmail.com>
Date: Thu, 6 Jul 2023 16:16:31 +0200
Subject: [PATCH] [fitting] Fix a bug in dtau computation for scale-only
 derivatives

---
 Ponca/src/Fitting/gls.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Ponca/src/Fitting/gls.hpp b/Ponca/src/Fitting/gls.hpp
index 6fd522de5..39533c7c7 100644
--- a/Ponca/src/Fitting/gls.hpp
+++ b/Ponca/src/Fitting/gls.hpp
@@ -30,7 +30,7 @@ GLSDer <DataPoint, _WFunctor, DiffType, T>::dtau() const
     ScalarArray dfield = Base::m_dUc;
     // Recall that tau is the field function at the evaluation point, we thus must take care about
     // its variation when differentiating in space:
-    if(this->isScaleDer())
+    if(this->isSpaceDer())
       dfield.template tail<DataPoint::Dim>() += Base::m_ul;
 
     return (dfield * prattNorm - Base::m_uc * cfactor * Base::dprattNorm2()) / prattNorm2;