From 1d2bcd60d3e0cb8649ba5d2ae8672457849656ce Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Fri, 10 Jun 2011 01:21:32 -0600
Subject: Make the test DE care about x.

---
 tests/Euler.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'tests/Euler.cpp')

diff --git a/tests/Euler.cpp b/tests/Euler.cpp
index 1741dc8..47b5b55 100644
--- a/tests/Euler.cpp
+++ b/tests/Euler.cpp
@@ -23,11 +23,11 @@
 #include <iostream>
 #include <iomanip>
 
-// y' = y (y == C*exp(x))
+// y' = x*y (y == C*exp(x^2/2))
 double
 f(double x, double y)
 {
-  return y;
+  return x*y;
 }
 
 int
@@ -49,7 +49,7 @@ main()
             << "Iterations: " << integrator.iterations() << std::endl;
 
   double error = std::abs(expected - actual)/std::abs(expected);
-  if (error > 0.01 || !std::isfinite(error)) {
+  if (error > 2.3e-2 || !std::isfinite(error)) {
     std::cerr << "Error:      " << 100.0*error << "%" << std::endl;
     return EXIT_FAILURE;
   } else {
-- 
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