From 8d4f32bc8e8f00092e1cefedd2e4e0ab88a03326 Mon Sep 17 00:00:00 2001
From: Oliver Sander <sander@igpm.rwth-aachen.de>
Date: Sun, 10 Apr 2011 13:41:23 +0000
Subject: [PATCH] check the energy gradient using an fd approximation
[[Imported from SVN: r7132]]
---
test/harmonicenergytest.cc | 39 +++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/test/harmonicenergytest.cc b/test/harmonicenergytest.cc
index c8ebbba0..fcc88fde 100644
--- a/test/harmonicenergytest.cc
+++ b/test/harmonicenergytest.cc
@@ -49,6 +49,42 @@ void testEnergy(const GridType* grid, const std::vector<TargetSpace>& coefficien
}
+template <class GridType>
+void testGradientOfEnergy(const GridType* grid, const std::vector<TargetSpace>& coefficients)
+{
+ HarmonicEnergyLocalStiffness<typename GridType::LeafGridView,TargetSpace> assembler;
+
+ std::vector<typename TargetSpace::EmbeddedTangentVector> gradient;
+ assembler.assembleEmbeddedGradient(*grid->template leafbegin<0>(),
+ coefficients,
+ gradient);
+
+ ////////////////////////////////////////////////////////////////////////////////////////
+ // Assemble finite difference approximation of the gradient
+ ////////////////////////////////////////////////////////////////////////////////////////
+
+ std::vector<typename TargetSpace::EmbeddedTangentVector> fdGradient;
+ assembler.assembleEmbeddedFDGradient(*grid->template leafbegin<0>(),
+ coefficients,
+ fdGradient);
+
+ double diff = 0;
+ for (size_t i=0; i<fdGradient.size(); i++)
+ diff = std::max(diff, (gradient[i] - fdGradient[i]).infinity_norm());
+
+ if (diff > 1e-6) {
+
+ std::cout << "gradient: " << std::endl;
+ for (size_t i=0; i<gradient.size(); i++)
+ std::cout << gradient[i] << std::endl;
+
+ std::cout << "fd gradient: " << std::endl;
+ for (size_t i=0; i<fdGradient.size(); i++)
+ std::cout << fdGradient[i] << std::endl;
+
+ }
+
+}
template <int domainDim>
void testUnitVector3d()
@@ -102,7 +138,8 @@ void testUnitVector3d()
}
testEnergy<GridType>(grid, coefficients);
-
+ testGradientOfEnergy(grid, coefficients);
+
}
}
--
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