Selecting lowest and highest values in columns 1 and 2, based on subsets in column 3

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Selecting lowest and highest values in columns 1 and 2, based on subsets in column 3
# 1  
Old 04-25-2012
Selecting lowest and highest values in columns 1 and 2, based on subsets in column 3


I have a file with the following columns:

361459  447394  CHL1
290282  290282  CHL1
361459  447394  CHL1
361459  447394  CHL1
178352861  178363529  AGA
178352861  178363529  AGA
178363657  178363657  AGA

Essentially, using CHL1 as an example. For any line that has CHL1 in column 3, I want to select the lowest value in column 1 , and the highest value in column 2. These should then produce a single line that looks like

 290282 447394 CHL1

Using the same principle, for AGA, the line should look like

 178352861 178363657 AGA

The whole file contains a about 500 unique names in column 3. CHL1 and AGA would be 2/500. Some sort of loop to run through each of these names would be perfect. I'm very new to Linux and have a bit of knowledge in very basic use of AWK, sed, grep ect but I'm unsure how to maniplulate the file to get the output as stated above.

Any help would be very much appreciated!
# 2  
Old 04-25-2012
awk  '{ max[$3]=($2>max[$3])? $2: max[$3];
           if(! $3 in min) {min[$3]=999999999};  
           min[$3]=($1<min[$3])? $1: min[$3];
        END {
               for(i in min){ print  min[i], max[i], i}
        } '   inputfilename  > outputfilename

Assuming I understood... try this.
This User Gave Thanks to jim mcnamara For This Post:
# 3  
Old 04-25-2012
Hi, many thanks for your reply! That prints the max value in column 2 for the specific name in column 3, but not the minimum value in column 1. I'll have a play and see if I can get that to work. One solution that was provided elsewhere was, which works perfectly is:


awk '{
if ( larr[$3] == "" ) {
  larr[$3] = $1
  harr[$3] = $2 
if ( larr[$3] != "" ) {
  if ( larr[$3] >= $1 ) { larr[$3] = $1 }
  if ( harr[$3] <= $2 ) { harr[$3] = $2 }
END { for (x in larr)
     print larr[x], harr[x],x
}' infile > outfile

Thanks again for your help!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help with shell script: selecting rows that have the same values in two columns

Hello, everyone I am beginner for shell programming. I want to print all lines that have the same values in first two columns data: a b 1 2 a a 3 4 b b 5 6 a b 4 6 what I expected is : a a 3 4 b b 5 6 but I searched for one hour in... (2 Replies)
Discussion started by: nengcheng
2 Replies

2. Shell Programming and Scripting

Sort from highest to lowest number

Hi Guys, I am looking for a way to sort the output below from the "Inuse" count from Highest to Lowest. Is it possible? Thanks in advance. user1 0.12 0.06 0 0.12 User Inuse Pin Pgsp Virtual Unit:... (4 Replies)
Discussion started by: jaapar
4 Replies

3. Linux

To get all the columns in a CSV file based on unique values of particular column

cat sample.csv ID,Name,no 1,AAA,1 2,BBB,1 3,AAA,1 4,BBB,1 cut -d',' -f2 sample.csv | sort | uniq this gives only the 2nd column values Name AAA BBB How to I get all the columns of CSV along with this? (1 Reply)
Discussion started by: sanvel
1 Replies

4. UNIX for Dummies Questions & Answers

Awk, highest and lowest value of a column

Hi again! I am still impressed how fast I get a solution for my topic "average specific column value awk" yesterday. The associative arrays in awk work fine for me! But now I have another question for the same project. Now I have a list like this 1 -0.1 1 0 1 0.1 2 0 2 0.2 2 -0.2 How... (10 Replies)
Discussion started by: bjoern456
10 Replies

5. Shell Programming and Scripting

Selecting lines having same values for first two columns

Hello to all. This is first post. Kindly excuse me if I do not adhere to any rules and regulations of this forum. I have a file containing some rows with three columns each per row(separeted by a space). There are certain rows for which first two columns have same value but the value in... (6 Replies)
Discussion started by: manojmalhotra13
6 Replies

6. Shell Programming and Scripting

top 10 highest and lowest percentile from a column

Hi, I want to extract the the top 10 and lowest 10 percentile for a column of values. For example in column 2 for this file: JOE 1 JAY 5 JAM 6 JIL 8 JIB 4 JIH 3 JIG 2 JIT 7 JAM 9 MAR 10 The top 10 lowest will be: JOE 1 and the top 10 highest will be: (2 Replies)
Discussion started by: kylle345
2 Replies

7. UNIX for Dummies Questions & Answers

HELP Script don't work selecting lowest value!!!

Hy again guys, Last week i resolve a question here but now i need your help again :rolleyes: I have about 3000 files that i need to choose based on the lowest value, so i make temp files like this: The files can have lines from 1-10 but only 2 columns, the point is to grep the name os the... (2 Replies)
Discussion started by: MetaBolic0
2 Replies

8. Shell Programming and Scripting

selecting record by matching in two columns values

Hi Guys ! i want to search a record in file by matching two values in a record in two different columns suppose i have 3 columns and i want to select all those values from col1 for which in col3 has a specific value e.g select all "john" from column1 where column 3 has a value of "20" ... (9 Replies)
Discussion started by: ourned
9 Replies

9. Shell Programming and Scripting

Selecting rows based on values in columns

Hi My pipe delimited .txt file contains rows with 10 columns. Can anyone advise how I output to file only those rows with the letters ‘ci' as the first 2 characters in the 3rd column ? Many thanks (4 Replies)
Discussion started by: malts18
4 Replies

10. Shell Programming and Scripting

Perl ? - How to find and print the lowest and highest numbers punched in by the user?

. . . . . . (3 Replies)
Discussion started by: some124one
3 Replies
Login or Register to Ask a Question

Featured Tech Videos