[Gnuplot-info] Help plotting "jittered" datapoints

[marcel1 <cemarcel@u.washington.edu>]

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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