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Dead Lock issue for IIR component

Question asked by TNAKA on Jul 4, 2007
Latest reply on Jul 8, 2007 by TNAKA

Assume implementing a delaying type integrator, z^-1/(1-z^-1) on Ptolemy.

There are two methods for this purpose.

(1) Using Delay and Adder.
(2) Using IIR componet with  Numerator="0,1" Denominator="1,-1".

These two give us same transfer function, z^-1/(1-z^-1).
But I encountered "Dead Lock", if (2) is used in loop. On the other hand, (1) doesn't cause "Dead Lock".

I think IIR component should have initial value setting ability.