Hi all,
Okay then, I may have been somewhat "previous" in selling my 49G+ last year and replacing it with a TI84+SE as I have been having problems with the TI which are closely related to the problem discussed here. In short, Valentin's A-matrix cannot be effectively inverted in the TI as the lack of precision leads to the conclusion that the matrix is singular. :-(
I'll admit it here, I made a mistake! I will be sorting out monies for a new 49G+ shortly to tide me over until the OpenRPN project comes to fruition.
Tra
JasonG