50g

Hello, I'm learning to use program BODE-ROUTH
(http://www.hpcalc.org/details. php? id=3176), that it uses NEOPOLYS
(http://www.hpcalc.org/details. php? id=3169). But when I try to
insert the negative coefficients or negative roots of the polynomial
at the numerator and at the denominator, and trying to trace the
diagram, for example Bode, give back error to me: 

NEG Error: Bad Argument Type or 
ABS Error: Bad Argument Type! 

I have tried also on the emu48 but the behavior is the same one. 

e.g.: 

2:      {1 -2 1} 
1:   {1 -3 2 -1} 

2:       {1 2 1} 
1: {{0 1 -2 -3}} 

With all the positive values they do not give error to me. Someone can
help me? Best regards, Simone.