Re: [Gnuplot-info] plot distribution

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

first we need a function for binning the x-data, i.e. the
continuous x-range is split into intervals of size 's':
bin(x, s) = s*int(x/s)

then we plot:
plot "datafile" using (bin($2,0.01)):(10/300.) \
   smooth frequency \
   title 'smooth frequency' with boxes

explanation:
- the bin-function assigns the x-values within one interval
  (which has a width of 0.01 here) to only one x-value (the
  lower interval border)
- with 'smooth frequency' all the y-values of data pairs
  with the same x-value are added
- "10/300." is just a factor, you could use "1." then each
  data counts as '1'


jamborta wrote:
> 
> thanks a lot. could you explain the parameters of this method
> 
> plot [0:] "datafile" u 2:(0.25*rand(0)-.35) t '', "" u
> (bin($2,0.01)):(10/300.) s f t 'smooth frequency' w boxes, "" u 2:(1/300.)
> s cumul t 'smooth cumulative'
> 
> especially 10/300. and 1/300.
> 
> I couldn't figure out why it normalises in the demo, but not for my data.
> 
> thanks a lot
> 
> 
> Thomas Sefzick wrote:
>> 
>> have a look at the gnuplot 4.3-cvs demo:
>> 
>> http://gnuplot.sourceforge.net/demo_4.3/smooth.html
>> 
>> 
>> jamborta wrote:
>>> 
>>> hi guys,
>>> 
>>> I have a continuous random variable with around 1200 values. I'd like to
>>> plot the distribution of that dataset. I guess I could set up some
>>> intervals and count how many values fall into that interval. is that
>>> doable with gnuplot?
>>> 
>>> thanks,
>>> tamas
>>> 
>>> 
>> 
>> 
> 
> 

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