--- In 50g@yahoogroups.com, "Simone" <gems_tux@...> wrote:
>
> 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.
>

I have resolved the problem using the key [-] and not [+/-]

Simone