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From: Ethan A Merritt <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: set range for second independent variable in special file '++'
Date: Mon, 20 Mar 2017 12:38:49 -0700
Organization: gnuplot development
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Ethan A Merritt wrote:

> Karl Ratzsch wrote:
> 
>> Am 20.03.2017 um 17:39 schrieb Ethan A Merritt:
>>> Karl Ratzsch wrote:
>>>> . Can i set the range for the second independent variable of "++" and
>>>> still set the x,y display range independently?
>>>>
>>>> I managed to do it plotting the numbers to a table, and then plotting
>>>> that with different (auto)ranging:
>>>
>>> Those commands as shown do not work.
>>> There must be some other stuff you don't show.
>>> I still a can't figure out what you are aiming for here,
>>> so I can't offer a suggestion how else to get there.
>> 
>> (Sorry for the copypasted nonsense.)
>> 
>>  set xr [-9:9] ; set yr [-1:1]
>>  set table $dat
>>  splot '++' using (cos($1)):(sin($1)):($1+$2) w l
>>  unset table
>> 
>>  reset
>>  splot $dat w l
>> 
>> It seems I can only specify one independent variable with range for
>> '++'. Is that so?
> 
> Yes, but...
> That's mostly because it's not clear how one could use it.
> If you have an example of a type of plot that this would allow,
> I'd be happy to look into adding it.
> 
>> I want to plot a ribbon wound on a cylindrical core (not actually such a
>> boring one, but nevermind).
> 
> Hmm.  The way I know of is this:
> 
> set xrange [-1:1]
> set yrange [-1:1]
> rise = 3.
> radius = 0.5
> set parametric
> splot radius*sin(u), radius*cos(u), (rise*u-v)

Bonus points for style:

  set isosample 100, 10
  set hidden3d
  replot