id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1225	derivative annotation in function casuses the function to not be added to the DAE functiontree	Per Östlund	Per Östlund	"If a function has a derivative annotation, then only it's derivative is added to the function tree of the DAE, and not the function itself. Example:
{{{
function g 
  input Real x;
  output Real z;
algorithm
  z := x+1;
end g;

function f 
  input Real x;
  input Real y;
  output Real z;
  annotation(derivative(noDerivative(y=g(x)))=f_der);
algorithm
  z_der := x_der*cos(x);
end f;

function f_der
  input Real x;
  input Real y;
  input Real x_der;
  output Real z_der;
algorithm
  z_der := x+y+x_der;
end f_der;

model Derivative3
  Real x[3];
  Real u[3](each fixed=false);
  type IC=Real(start=0,fixed=true);
  IC ic[2]=x[1:2]-u[1:2];
equation
  x[1]=f(exp(time),g(exp(time)));
  der(x[1:2])=x[2:3];
  x[3]=u[3];
  der(u[1:2])=u[2:3];
end Derivative3;
}}}

Output from omc:
{{{
function f_der
input Real x;
input Real y;
input Real x_der;
output Real z_der;
algorithm
  z_der := x + y + x_der;
end f_der;

function g
input Real x;
output Real z;
algorithm
  z := 1.0 + x;
end g;

fclass Derivative3
Real x[1];
Real x[2];
Real x[3];
Real u[1](fixed = false);
Real u[2](fixed = false);
Real u[3](fixed = false);
Real ic[1](start = 0.0, fixed = true) = x[1] - u[1];
Real ic[2](start = 0.0, fixed = true) = x[2] - u[2];
equation
  x[1] = f(exp(time),g(exp(time)));
  der(x[1]) = x[2];
  der(x[2]) = x[3];
  x[3] = u[3];
  der(u[1]) = u[2];
  der(u[2]) = u[3];
end Derivative3;
}}}"	defect	closed	critical		Instantiation	1.6.0	fixed		Per Östlund Per Östlund