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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: How to plot a vertical line in GNUPLOT, say x=3.
Date: Tue, 20 Nov 2018 17:26:42 +0100
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Am 20.11.2018 um 17:12 schrieb Darshan Beniwal:
> On Tuesday, November 20, 2018 at 8:08:39 PM UTC+5:30, Karl Ratzsch wrote:
>> Am 17.11.2018 um 15:18 schrieb Gavin Buxton:
>>> plot (x<3?-10:10)
>>>
>>
>> nice, but not perfectly vertical ;-)
>>
>>    plot "+" us (3):(x<3?-10:10) w l
>>
>> otherwise
>>
>>   set arrow 1 nohead from 3,-10 to 3,10
> 
> Yes, you are right Karl Ratzsch. I made a plot with your command also, gives me required to my work.
> But Gavin Commands also gives me the perfect verticle line. I don't know why you said: "not perfectly verticle." 
> Thank you Karl .


  set sample 100 # that's the default
  plot (x<3?-10:10)
  replot "+" us (3):(x<3?-10:10) w l

if you increase the sampling, it _looks_ nearly vertical, but still isn't.