id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2404	Iteration variables with default zero	Christian Schubert	Lennart Ochel	"Here is a small system which has a block of type 'Jacobian Time varying', i.e. a linear system.
{{{
model Test
  Real x, y, z;
equation
  z = sin(time);
  z*x + y = 2;
  x - z*y = 2; 
end Test;
}}}

When I simulate this model, I get the following warning:
{{{
Warning: Iteration variables with default zero start attribute in equation system:
         y:VARIABLE() .Test, .Real type: Real
         x:VARIABLE() .Test, .Real type: Real
}}}

I do not think that this warning is necessary for linear systems. Although the jacobian is time varying, it does not depend on x and y. Therefore the start values of x and y should not influence the solution.
It is a different story, if the system was nonlinear."	enhancement	closed	high	1.9.0	Backend	trunk	fixed	warning iteration variables