id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2204	OMC should warn about iteration variables with default zero start attribute	Francesco Casella	Lennart Ochel	"Initialization problem often involve nonlinear equations, which must be solved by iterative methods. Initial guesses for the involved iteration variables are taken from the variables' start attribute.

In many cases, the start attribute for a certain variable is not set anywhere, so its default value (i.e., zero) is taken. In many cases this is a very bad choice, that can lead to errors such as division by zero, logarithm of zero, square root of negative number, etc.

When translating a model for simulation, OMC should optionally warn about iteration variables of the initialization problem having the default zero start value. The warning should mandatorily be issued in case the initialization fails, as setting the missing start attributes to reasonable initial guesses is often necessary in order to achieve convergence, so this is a key information for troubleshooting."	defect	closed	high	1.9.4	Backend	trunk	fixed		Lennart Ochel