Re: if-expression and variables

On 06/10/2011 07:56 PM, Stefan Karrmann wrote:
> Dear all,
>
> we can help ourselves in some cases by:
>
> sign x == (abs x)/x
> H x == (1 + sign x)/2
> step (a,b,x) == (H(x-a)) * (H(b-x))
>
> The drawback is that we get a 'Division by zero'.

Show a short program that demonstrates this error message. Only then is 
somebody able to help.

Ralf

PS: "sign" is already built-in. Try out

)display op sign

.