the normalization factor needs to be know before you plot.
what you could do:
- make a dummy plot (see 'set table') to count the data entries,
have a look at:
http://gnuplot.sourceforge.net/demo_4.3/data_feedback.html
(look for 'sum')
- calculate the normalization factor
- do the plot
e.g.:
set table
sum=0
plot 'datafile' using 1:(sum=sum+$1)
unset plot
print sum
plot 'datafile' using 1:(1./sum) smooth frequency with boxes
jamborta wrote:
>
> that's great. it's clear now. maybe it'd be useful to have a function that
> counts how many entries the set has, so it'd be easy to normalise it.
>
>
> Thomas Sefzick wrote:
>>
>> 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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