Visit Our UNIX and Linux User Community


awk to median


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting awk to median
# 1  
Old 01-26-2009
awk to median

hi!

i have a file like the attachement.
you can see on the last column, there is a marker from 1 to 64 for each time.
I'd like to have the median for each marker: i want to get a median every 128 values


the result is : for an hour and marker x, i have the median value

thank you for your help!
# 2  
Old 01-27-2009
By "median", do you mean this?

By "every 128 values", do you mean every 128 lines? And do you want the median for each set of 128 lines, as opposed to the running median?

Assuming yes... and you have gawk
Code:
gawk -v max=128 '
        function median(c,v,  j) { 
           asort(v,j); 
           if (c % 2) return j[(c+1)/2]; 
           else return (j[c/2+1]+j[c/2])/2.0; 
        } 
{ 
         count++;values[count]=$NF;  
         if (count >= max) { 
           print  median(count,values); count=0; 
         } 
} 
END { 
         print  median(count,values); 
}'

# 3  
Old 01-27-2009
i use awk
that's the good link for median.
in fact, i want the median of each set of 128 lines
your script does that?

Last edited by riderman; 01-27-2009 at 10:14 AM..
# 4  
Old 01-27-2009
yep. i think so. I tested it on sets of 10 instead of 128 and it seemed to work correctly.
# 5  
Old 01-27-2009
excuse me
i'm a newbie, but how can i use it with the input file?

sorry for my question.
# 6  
Old 01-27-2009
sorry!!
no need to answer!!

many thanks!!!!

Previous Thread | Next Thread
Test Your Knowledge in Computers #997
Difficulty: Medium
The use of hypervisor technology by malware and rootkits installing themselves as a hypervisor below the operating system is known as hyperjacking.
True or False?

7 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to print median values of matrix -awk?

I use the following script to print the sum and how could I extend this to print medians instead? thanks name s1 s2 s3 s4 g1 2 8 6 5 g1 5 7 9 9 g1 6 7 8 9 g2 8 8 8 8 g2 7 7 7 7 g2 10 10 10 10 g3 3 12 1 24 g3 5 5 24 48 g3 12 3 12 12 g3 2 3 3 3 output name s1 s2 s3 s4 g1 5 7 8 9... (5 Replies)
Discussion started by: quincyjones
5 Replies

2. UNIX for Dummies Questions & Answers

Median calculator based on id match

I am trying to calculate the median of a column of numbers if they match an ID type on a different column. The input file has 3 columns. The column that has the ID is column 1 and the column with the values I'd like to find the median for is column 3. The file does not need to be sorted. What I... (9 Replies)
Discussion started by: verse123
9 Replies

3. Shell Programming and Scripting

Median and max of duplicate rows

Hi all, plz help me with this, I want to to extract the duplicate rows (column 1) in a file which at least repeat 4 times. then I want to summarize them by getting the max , mean, median and min. The file is sorted by column 1, all the repeated rows appear together. If number of elements is... (5 Replies)
Discussion started by: ritakadm
5 Replies

4. Shell Programming and Scripting

Awk based script to find the median of all individual columns in a data file

Hi All, I have some data like below. Step1,Param1,Param2,Param3 1,2,3,4 2,3,4,5 2,4,5,6 3,0,1,2 3,0,0,0 3,2,1,3 ........ so on Where I need to find the median(arithmetic) of each column from Param1...to..Param3 for each set of Step1 values. (Sort each specific column, if the... (5 Replies)
Discussion started by: ks_reddy
5 Replies

5. Shell Programming and Scripting

Compute the median of a set of numbers with AWK?

Is there a way in awk to compute the median of a set of numbers in a file in the following format. 34 67 78 100 23 45 67 (3 Replies)
Discussion started by: Lucky Ali
3 Replies

6. UNIX for Dummies Questions & Answers

Help with Median

Hi, I know this question has been asked before, but I'd like to ask for some explanation rather than solution regarding finding median in unix. I've got a simple one column file with over 2 million numbers and I need to find its median. The file looks like this: 0.123 0.235 0.890 0.000 etc... (11 Replies)
Discussion started by: zajtat
11 Replies

7. UNIX for Dummies Questions & Answers

Calculate the Median, first quartile and third quartile using AWK

Hi all, I have a data range as follow: 28 33 42 12 9 68 81 55 6 47 Since I want to create Box & Whisker Plot, I need to calculate the median, first quartile and third quartile of above data using AWK.( so far I can only writing a code for determine smallest value & largest value... (4 Replies)
Discussion started by: nica
4 Replies

Featured Tech Videos