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Groups > comp.graphics.apps.gnuplot > #2347

Re: Major and minor ticks artifact

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On 15.03.2014 06:17, sfeam wrote:
> Janis Papanagnou wrote:
> 
>> On 02.03.2014 20:10, Hans-Bernhard Bröker wrote:
>>> On 02.03.2014 18:19, Janis Papanagnou wrote:
>>>> I noticed an ugly artifact that at on place a minor tic is
>>>> unnecessarily displayed, and even straight *besides* the major tic.
>>>> This was with a png
>>>> term definition  set term png size 800,600 . If I change that
>>>> definition
>>>> to  set term png size 800,599  the artifact disappears. It's, yet
>>>> again, a work-around.
>>>>
>>>> Is that how gnuplot works and how experienced people "solve" such
>>>> issues, or is there any better approach?
>>>
>>> How is anyone supposed to be able to answer that if you didn't even
>>> start to describe what you actually did in gnuplot to get this
>>> effect?
>>
>> I am sorry that I didn't expand on details of the code. I was hoping
>> that such an observation - meanwhile I'd just call it a bug[*] - is
>> well known, so that there's already some standard hint to that. (Has
>> that really never been observed before? Hard to believe, but anyway.)
>>
>> What I did was defining a y-axis range with major tics=1 and minor
>> tics=0.1 resolution, or, if you prefer actual code...
>>
>>   set ytics 10
>>   set mytics 2
>>   set y2tics 1
>>   set my2tics 10
>>
>> The range of the y2 axis (where I observed the artifact) was defined
>> as
>>
>>   set y2r [0:6]
> 
> I am going to guess that you have misinterpreted what you are seeing in
> the plot.   It is not an extra tic on any single axis.  Instead the
> problem is that you are plotting two set of tics on each axis 
> and since the end-points of the two axes do not match up,
> neither do the tics.   
> 
> The crucial thing missing from the commands you show above is the "nomirror"
> attribute.  Without it the y tics are drawn on both the right and left sides,
> the y2 tics are also drawn on both the right and left sides, and
> hilarity results when ymin != y2man  or ymax != y2max or both.
> 
> Note that unless you do somethine to tie them together, the y and y2
> axes are scaled independently.

I have to apologize again! I really should have posted the whole gnuplot
program to not mislead the readers here. Actually I *have* the command

  set ytics nomirror

in my code! That is a sufficient command IIUC? But, in addition, the two
y-axis tics also always correlate; the ranges are choosen so that the y2
axis' tics are always a superset of the y axis. The y-range is of size 60
with major tics every 10 steps and minor tics every 5 units, defined as

  set ytics 10
  set mytics 2

So, IIUC, I have implemented _two separate means_ to not make happen what
you assumed.

You can inspect the outcome at

  http://volatile.gridbug.de/ytics599.png   ## looks ok
  http://volatile.gridbug.de/ytics600.png   ## y2 artifact at y-value 1

and find the gnuplot definitions of the test program (for ok case "599")
here

  http://volatile.gridbug.de/ytics

Thanks.

Janis

> 
> 	Ethan
> 

[...]

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Thread

Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-02 18:19 +0100
  Re: Major and minor ticks artifact Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2014-03-02 20:10 +0100
    Re: Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-14 23:54 +0100
      Re: Major and minor ticks artifact sfeam <sfeam@users.sourceforge.net> - 2014-03-14 22:17 -0700
        Re: Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-15 10:54 +0100
          Re: Major and minor ticks artifact Karl <mail.kfr@gmx.net> - 2014-03-18 18:38 +0100
            Re: Major and minor ticks artifact Hermann Peifer <peifer@gmx.eu> - 2014-03-20 07:10 +0100
      Re: Major and minor ticks artifact Hermann Peifer <peifer@gmx.eu> - 2014-03-15 13:27 +0100
        Re: Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-15 23:02 +0100
          Re: Major and minor ticks artifact Hermann Peifer <peifer@gmx.eu> - 2014-03-16 01:54 +0100
            Re: Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-21 05:52 +0100
          Re: Major and minor ticks artifact Dan Luecking <LookInSig@uark.edu> - 2014-03-20 12:24 -0500
            Re: Major and minor ticks artifact Janis Papanagnou <janis_papanagnou@hotmail.com> - 2014-03-21 05:54 +0100

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