id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2428	numerical instability	Willi Braun	somebody	"Following model behaves numerical instable:
{{{
loadString(""
model testCFExpr1
  Real x;
initial equation
  der(x) = 3.14159/2;
equation
  sin(der(x)) = cos(x);
end testCFExpr1;
"");

simulate(testCFExpr1, stopTime=10, tolerance=1e-4);
val(x,0);
val(x,10);

val(der(x),0);
val(der(x),10);

simulate(testCFExpr1, stopTime=10, tolerance=1e-5);
val(x,0);
val(x,10);

val(der(x),0);
val(der(x),10);

simulate(testCFExpr1, stopTime=10, tolerance=1e-6);
val(x,0);
val(x,10);

val(der(x),0);
val(der(x),10);

simulate(testCFExpr1, stopTime=10, tolerance=1e-7);
val(x,0);
val(x,10);

val(der(x),0);
val(der(x),10);

simulate(testCFExpr1, stopTime=10, tolerance=1e-8);
val(x,0);
val(x,10);

val(der(x),0);
val(der(x),10);
}}}
"	defect	new	high	1.9.1	Run-time	trunk