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Top Forums Shell Programming and Scripting Finding when a file switches direction using awk Post 302543977 by bflinchum on Tuesday 2nd of August 2011 03:12:54 PM
Old 08-02-2011
Niether of them worked; the problem was it seemed to pick random points not the peaks (I plotted them using GMT).

Instead of accepting defeat can I trouble you for a little explanation, if I understood the logic a little better I think I could tweak it. I am still new at awk but my professor loves it, and the more I use it the more I realize how powerful it actually is.


Code:
awk 'NR==1{last=$2;lost_row=$1;getline;cur=$2;cur_row=$1;next}

This is the part I don't quite understand. What exactly does NR == 1 accomplish? Your setting the number of rows equal to one? does a ';' seperate commands? So you set last equal to column 2, lost_row equal to column one.
Why do your run a getline? I looked it up and it is defined as:
getline - returns 1 if it finds a record, and 0 if the end of the file is encountered

Anyways I get the feeling that $1 and $2 are now rows above and below not columns?


Code:
  {if (last>=cur&&$2<=cur) print cur_row; 
      last=cur;last_row=cur_row;cur=$2;cur_row=$1}' infile

This part logically makes sense, and this is what I am trying to accomplish.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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