Re: Touchup of history.c

[Petr M. <mi...@ph...>]

> > I propose "set history 0" means not to store history commands to the 
> > .gnuplot_history file.
>
> I assume you mean that the .gnuplot_history file remains as it was when 
> the user entered gnuplot, not that the .gnuplot_history ends up empty.

yes

> > > > >Several of these options may be overridden by similar qualifiers in the
> > > > >history command.
> > > > >     set history {<int>}
> > > >
> > > >I tried that "set history -1" makes an error.
> > >
> > >gnuplot> set history -1
> > >                     ^
> > >         Unrecognized option.
> > >
> > >Are you getting something else? 
> > 
> > 
> > I get the same.
> > 
> > 
> >  Of course, that means the following also
> > 
> > 
> > >Should we be recognizing the sign and then issuing an error if negative?
> > 
> > 
> > Yes.
> 
> I began programming this, but now I hesitate to do so.  It would be something
> like
> 
> n = 1;
> if (equals(c_token,"-")) {
>     n *= -1;
>     c_token++;
> } else if (equals(c_token,"+"))
>     c_token++;
> n *= int_expression();

I think you can use simply
  if (isanumber(c_token)) {
	act on integer
  }

---
PM