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Top Forums Shell Programming and Scripting awk to select lines with maximum value of each record based on column value Post 302988192 by yifangt on Wednesday 21st of December 2016 03:48:58 PM
Old 12-21-2016
awk to select lines with maximum value of each record based on column value

Hello,
I want to get the maximum value of each record separated by empty line based on the 3rd column of each row within each record?
Input:
Code:
A1    chr5D    634    7    82    707
A2    chr5D    637    6    82    713
A3    chr5D    637    5    82    713
A4    chr5D    626    1    82    704
A5    chr5D    723    0    1    723
A6    chr5D    734    12    1    722
A7    chr5D    719    3    1    715
                    
B5    chr6B    344    2    64    403
B6    chr6B    738    1    1    735
B7    chr6B    738    5    1    732
B8    chr6B    738    1    1    735
B9    chr6D    732    0    1    732
B10    chr6D    735    1    1    735
B11    chr6D    735    1    1    735
                    
C1    chr6D    735    0    1    735
C2    chr6D    735    2    1    732
C3    chr6D    735    0    1    735
                    
C4    chr7A    678    0    1    678
C5    chr7A    681    10    1    660
C6    chr7A    678    0    1    678
C7    chr7A    674    11    42    687

Output:
Code:
A6    chr5D    734    12    1    722
B8    chr6B    738    1    1    735
C3    chr6D    735    0    1    735
C5    chr7A    681    10    1    660

So far, I have tried:
Code:
awk 'BEGIN{FS="\n"; RS=""} $3 > max[NR] {maxline[NR]=$0} END{ for (i in maxline) {print maxline[i]}}' input.tab

but it did not give what I expected.
There are several issues with my script.
1) $3 is for each line, but not correct within each record;
2) same issue with $0;
It seems to me the trick is the FS value and maxline[NR]=$0 in my case.

Thanks a lot!

Last edited by yifangt; 12-21-2016 at 05:13 PM..
 

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ODBC_RESULT(3)								 1							    ODBC_RESULT(3)

odbc_result - Get result data

SYNOPSIS
mixed odbc_result (resource $result_id, mixed $field) DESCRIPTION
Get result data PARAMETERS
o $result_id - The ODBC resource. o $field - The field name being retrieved. It can either be an integer containing the column number of the field you want; or it can be a string containing the name of the field. RETURN VALUES
Returns the string contents of the field, FALSE on error, NULL for NULL data, or TRUE for binary data. EXAMPLES
The first call to odbc_result(3) returns the value of the third field in the current record of the query result. The second function call to odbc_result(3) returns the value of the field whose field name is "val" in the current record of the query result. An error occurs if a column number parameter for a field is less than one or exceeds the number of columns (or fields) in the current record. Similarly, an error occurs if a field with a name that is not one of the fieldnames of the table(s) that is(are) being queried. Example #1 odbc_result(3) examples <?php $item_3 = odbc_result($Query_ID, 3); $item_val = odbc_result($Query_ID, "val"); ?> NOTES
Field indices start from 1. Regarding the way binary or long column data is returned refer to odbc_binmode(3) and odbc_longreadlen(3). PHP Documentation Group ODBC_RESULT(3)
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