Re: [Gnuplot-info] Help plotting "jittered" datapoints

[Thomas S. <t.s...@fz...>]

to jitter x-values just add a random number between -0.5 and 0.5
scaled with a fixed value:

w=0.4
plot "myfile" using ($1+w*(rand(0)-0.5)):2


marcel1 wrote:
> 
> Hello users,
> I would like to plot data which have various Y values, but share only one
> of two possible x values. to better distinguish datapoints, I would like
> to "jitter" the x values slightly (ie add some random noise to the x
> value). I have looked a lot online, found only a very sparse entry in
> "gnuplot in action" which suggests the following command: 
> 
>>plot "myfile" u 1:(0.25*rand(0)-.35) 
> 
> I understand how rand(0) could help, but can't quite figure out how to
> generalize from this to use in my plot instructions which have the form
> 
>> plot "myfile" u 1:2   #the 1 data column contains 1s and 2s  
> 
> so, 
>>plot "myfile" u rand(0)*1:2 
> 
> Strangely, this yields x-values up to 50 whereas i would have expected
> either 1 or 2 times some random decimal <1. 
> 
>>plot "myfile" u 1*(rand(0):2 # and various other permutations also bad
> 
> Clearly I am missing something. Any suggestions welcome.
> 
> Thanks, 
> marcel
> 
> 

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