50g

Hello, the command -> L (Laplace transform) of NEOPOLYS 8.1 fails on my HP
50g:

cos(a*t+b) -> L Error: Bad Argument Value
cos(2*t+3) -> L Error: Bad Argument Value
cos (2.*t+3.) -> (1. 0.)
(1. 0. 9.)

cos(a*x+b) = (-a*sin(b)+b*cos(a)*x)/(x^2+a^2) with LAP command.



Simone.

I don't use it so this is just a guess. It might be that it only works in approx mode, which could explain the different results you get for...

cos(2*t+3)
and
cos (2.*t+3.)

--- On Fri, 1/30/09, Simone <gems_tux@...> wrote:

> From: Simone <gems_tux@...>
> Subject: [50g] NEOPOLYS 8.1
> To: 50g@yahoogroups.com
> Date: Friday, January 30, 2009, 1:52 AM
> Hello, the command -> L (Laplace transform) of NEOPOLYS
> 8.1 fails on my HP
> 50g:
>
> cos(a*t+b) -> L Error: Bad Argument Value
> cos(2*t+3) -> L Error: Bad Argument Value
> cos (2.*t+3.) -> (1. 0.)
> (1. 0. 9.)
>
> cos(a*x+b) = (-a*sin(b)+b*cos(a)*x)/(x^2+a^2) with LAP
> command.
>
>
>
> Simone.

Hi Don,
Neopolys should work both approx mode that exact mode. However, the
Laplace transform (->L) of cos(2*t+3) -> (1. 0.)/(1. 0. 9.), i.e.
x/(x^2+9),is incorrect.
Indeed LAP(cos(2*x+3))=(cos(3)*x-2*sin(3))/(x^2+4).

--- In 50g@yahoogroups.com, Don Hart <ddhart1@...> wrote:
>
> I don't use it so this is just a guess. It might be that it only
works in approx mode, which could explain the different results you
get for...
>
> cos(2*t+3)
> and
> cos (2.*t+3.)
>
>
> --- On Fri, 1/30/09, Simone <gems_tux@...> wrote:
>
> > From: Simone <gems_tux@...>
> > Subject: [50g] NEOPOLYS 8.1
> > To: 50g@yahoogroups.com
> > Date: Friday, January 30, 2009, 1:52 AM
> > Hello, the command -> L (Laplace transform) of NEOPOLYS
> > 8.1 fails on my HP
> > 50g:
> >
> > cos(a*t+b) -> L Error: Bad Argument Value
> > cos(2*t+3) -> L Error: Bad Argument Value
> > cos (2.*t+3.) -> (1. 0.)
> > (1. 0. 9.)
> >
> > cos(a*x+b) = (-a*sin(b)+b*cos(a)*x)/(x^2+a^2) with LAP
> > command.
> >
> >
> >
> > Simone.
>