Print a row with the max number in a column


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# 1  
Print a row with the max number in a column

Hello,


I have this table:

Code:
chr1_16857_17742         -        chr1    17369   17436   "ENST00000619216.1";    "MIR6859-1";    -        67
chr1_16857_17742         -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        885
chr1_16857_18061        -        chr1    17369   17436   "ENST00000619216.1";    "MIR6859-1";    -        67
chr1_16857_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        1204
chr1_16857_18061        -        chr1    17369   17436   "ENST00000619216.1";    "MIR6859-1";    -        67
chr1_16857_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        1204
chr1_17232_18061        -        chr1    17369   17436   "ENST00000619216.1";    "MIR6859-1";    -        67
chr1_17232_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        829
chr1_17914_24891        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        6977
  chr1_18267_29570        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        11303

where I need based on the first column go through all the instances with the same pattern and print out only the rows where the last column has MAX value.



Desired output:


Code:
chr1_16857_17742         -       chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -       885
chr1_16857_18061        -       chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -       1204
chr1_17232_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        829
chr1_17914_24891        -       chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -       6977
chr1_18267_29570        -       chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -       11303

I tried this:



Code:
awk ' ! ( $1 in A_max ) { A_max[$1] = $NF } {A_max[$1] = ( A_max[$1] > $NF ? A_max[$1] : $NF )} END { for ( k in A_max ) print A_max[k], k }'

but I'm stuck on how to print out the whole row.


Would appreciate any help! Smilie

Last edited by coppuca; 02-13-2020 at 03:05 PM..
# 2  
try:

Code:
sort -k9 -n -r file | awk '!a[$1]++'

In output shown above, what happened to the max line for chr1_17232_18061?

Last edited by rdrtx1; 02-18-2020 at 07:19 PM..
This User Gave Thanks to rdrtx1 For This Post:
# 3  
Thank you! It works Smilie The chr1_17232_18061 was an accident.
Could you please explain how does
Code:
awk '!a[$1]++'

work? It collapses the rows with the same pattern in given column?
# 4  
It prints the line occurrence of column 1 ($1). a[$1]++ fails for the first occurrence increment since the array value for that key does not exist. The ! means not true so the expression is evaluated to true. The default action for true in awk is to print the line. In other terms: if the previous value of column 1 in array "a" cannot be incremented then print the line. The line could have been written as: '{if (! a[$1]++) print $0}'

Last edited by RavinderSingh13; 02-28-2020 at 01:42 AM..
This User Gave Thanks to rdrtx1 For This Post:
# 5  
Try as well
Code:
sort -k1,1 -k9nr  file | uniq -w16
chr1_16857_17742        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        885
chr1_16857_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        1204
chr1_17232_18061        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        829
chr1_17914_24891        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        6977
chr1_18267_29570        -        chr1    14404   29570   "ENST00000488147.1";    "WASH7P";       -        11303

# 6  
Regarding your initial attempt, it is quite close.
First, let me make a simplified version:
Code:
awk '! ($1 in A_Max) || $1 > A_Max[$1] { A_Max[$1]=$NF } END { for (a in A_Max) print A_Max[a],a }' file

Now, the final step is to store the lines in another array, along with the A_max[]
Code:
awk '! ($1 in A_Max) || $1 > A_Max[$1] { A_Max[$1]=$NF; L_Max[$1]=$0 } END { for (a in A_Max) print L_Max[a] }' file

The two arrays take some memory; the key field $1 is stored in both arrays.
It would be possible to only use a line array ...
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