Groups > comp.graphics.apps.gnuplot > #986

Re: alignmnet values xaxes and x2 axes

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From	Klaus Dahlke <klaus.dahlke@gmx.de>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: alignmnet values xaxes and x2 axes
Date	18 Mar 2012 11:07:24 GMT
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On Sat, 17 Mar 2012 23:43:25 -0700, sfeam wrote:

> Klaus Dahlke wrote:
> 
>> Hi all,
>> I use Gnuplot 4.6 on Linux with either x11 or wxt terminal.
>> I have a dataset consisting in 4 columns (analyzing workouts):
>> time run [sec], distanced run [m], pace [min/km], heart rate [-]
>> ...
>> 180, 500, 06:00, 140 ---
>> 360, 1030, 05:57, 145 ...
>> 540, 1555, 5:58, 144 ...
>> 
>> Points are taken every 3 seconds.
>> I'd like to use 'time run' ans x1axes and 'distance run' as x2axes in
>> such a way that when I position the mouse at e.g. x1=180 sec the info
>> shall show x2=500, position at x1=360, the info shall show x2=1030.
> 
> Both the x1 and x2 axes are linear, so unless there is a perfect
> correlation between your "time run" and "distance run" values it is not
> possible to have them all line up perfectly.
> 
> 
> 
>> I didn't find the trick to get that in an exact manner. With some minor
>> deviation it is achievable when set x1range and x2range to the
>> respective min/max values. Autoscale will bring some larger deviation.
> 
> The command "set autoscale fix" will prevent autoscale from adding any
> extra range to the axes.
> 
>> Is there any other trick to align the two x-axes to the values of the
>> datafile?
> 
> If the values in your file are not perfectly correlated then nothing you
> do is going to make them line up perfectly.
> 
> If it's just a question of having both values labeled for each time
> point, you might try:
> 
> set datafile separator ","
> set xlabel "Time"
> set x2label "Distance"
> set xtics set x2tics plot 'file' using 1:3:xtics(1):x2tics(2)
> 
> The labels along x2 will be correct, but the axis will be slightly
> non-linear.
> 
> 
>> Thanks,
>> Klaus

Thanks for the quick answer. Nup, they are not linear as I will not run 
with constant pace ...

Cheers,
Klaus

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Thread

alignmnet values xaxes and x2 axes Klaus Dahlke <klaus.dahlke@gmx.de> - 2012-03-17 21:53 +0000
  Re: alignmnet values xaxes and x2 axes sfeam <sfeam@users.sourceforge.net> - 2012-03-17 23:43 -0700
    Re: alignmnet values xaxes and x2 axes sfeam <sfeam@users.sourceforge.net> - 2012-03-17 23:45 -0700
    Re: alignmnet values xaxes and x2 axes Klaus Dahlke <klaus.dahlke@gmx.de> - 2012-03-18 11:07 +0000

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