## awk - calculation of probability density

 shell scripts awk - calculation of probability density
awk - calculation of probability density

Hi all!

I have the following problem: I would like to calculate using awk a probability of appearing of a pair of numbers x and y. In other words how frequently do these numbers appear?

In the case of only one integer number x ranged for example from 1 to 100 awk one liner has the form:
where datafile contains the number x:
My question is how to extend above awk one-liner for a pair of number x and y? In this case datafiles looks as follows:

Last edited by Franklin52; 07-20-2010 at 01:00 PM.. Reason: Please use code tags
 jarowit View Public Profile for jarowit Find all posts by jarowit
something like this:

HTH
This User Gave Thanks to Tytalus For This Post:
 Tytalus View Public Profile for Tytalus Find all posts by Tytalus
How to extend your one-liner to the case where non-integer numbers are present in the infile?

I was trying with this:

awk '{h[int(\$1/10)" "int(\$2/10)]++}END{for (i in h){print i*10,h[i]/NR}}' infile

but it does not work.

Last edited by jarowit; 07-21-2010 at 12:11 PM..
 jarowit View Public Profile for jarowit Find all posts by jarowit
It would work as is, if you want to group by values like 2.31313 and 2.31314, which may not be very useful - depends on the analysis you need to do. Otherwise you want to truncate decimals e.g., 2.31313 -> 2.31
sprintf("%f.2", number) rounds a real to 2 decimals.
 jim mcnamara View Public Profile for jim mcnamara Find all posts by jim mcnamara
How to change this formula in a such a way that it will return not only propabilty - h[i] but also the pair of number for which h[i] correspond ?
 jarowit View Public Profile for jarowit Find all posts by jarowit

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