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Full Discussion: Compare values in multiple rows in one column using awk
Top Forums UNIX for Beginners Questions & Answers Compare values in multiple rows in one column using awk Post 303043943 by jiam912 on Tuesday 11th of February 2020 02:50:26 PM
Old 02-11-2020
Compare values in multiple rows in one column using awk
I would like to compare values in column 8, and grep the ones where the different is > 1, columns 1 and 2 are the key for array.

Every 4 rows the records values in columns 1 and 2 changed. Then, the comparison in the column 8 need to be done for the 4 rows everytime columns 1 and 2 changed

input file

Code:
    47329,39785,2,12,10,351912.50,2533105.56,170.93,1
    47329,39785,2,12,28,351912.53,2533118.81,172.91,1
    47329,39785,3,6,7,351912.82,2533105.07,170.89,1
    47329,39785,3,6,20,351913.03,2533117.41,170.93,1
    47329,39797,2,12,10,352063.14,2533117.84,170.66,1
    47329,39797,2,12,28,352062.77,2533104.67,173.63,1
    47329,39797,3,6,7,352064.11,2533119.32,170.64,1
    47329,39797,3,6,20,352063.50,2533107.10,170.69,1
    47329,39809,2,12,10,352212.35,2533106.19,170.79,1
    47329,39809,2,12,28,352212.45,2533119.12,170.68,1
    47329,39809,3,6,7,352212.01,2533105.75,170.77,1
    47329,39809,3,6,20,352211.89,2533117.91,170.78,1
    47329,39821,3,6,7,352363.73,2533120.01,171.14,1
    47329,39821,3,6,20,352363.25,2533107.48,171.22,1
    47329,39821,2,12,10,352362.49,2533118.77,175.27,1
    47329,39821,2,12,28,352362.15,2533106.48,171.25,1

Desired output

Code:
 47329,39785,2,12,28,351912.53,2533118.81,172.91,1,
    47329,39797,2,12,28,352062.77,2533104.67,173.63,1
    47329,39821,2,12,10,352362.49,2533118.77,175.27,1

I have tried to substrat rows in column 8, but i am unable to get the desired output

Code:
 awk -F, '{$10 = $8 - prev8; prev8 = $8; print $0}' file

Thanks in advance for your help
 

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LEARN ABOUT DEBIAN

pgmtoimgv

PGMTOIMGV(1)						      General Commands Manual						      PGMTOIMGV(1)

NAME

       pgmtoimgv - Portable Graymap to Pilot Image Viewer converter, version 2.0.

SYNOPSIS

       pgmtoimgv [-h] [-v] [-4] [-t title] [-n notefile] [-{c|m|u}] [in [out]]

DESCRIPTION

       pgmtoimgv  is  a simple filter for converting Portable Graymaps to grayscale Pilot Image Viewer pdb files.  The input pgm file must use the
       following palette unless you specify the -4 switch:
	    P3
	    4 1
	    255
	      0   0   0
	     85  85  85
	    170 170 170
	    255 255 255
       if you specify -4, then your grayscale image must use this palette:
	    P3
	    16 1
	    255
	      0   0   0
	     17  17  17
	     34  34  34
	     51  51  51
	     68  68  68
	     85  85  85
	    102 102 102
	    119 119 119
	    136 136 136
	    153 153 153
	    170 170 170
	    187 187 187
	    204 204 204
	    221 221 221
	    238 238 238
	    255 255 255
       If your PGM file doesn't use one of these palettes, use ppmquant(1) to convert your palette.

       If an image's width is not a multiple of 16 pixels, enough extra white pixels will be added at the right side to ensure alignment.   Images
       will be padded, with white pixels, to a width and height of 160 if needed.

OPTIONS

       -h     Display a short summary of the command line options and exit.

       -v     Display the version and exit.

       -4     Use 4 bit grayscale (16 shades of gray).

       -t title
	      Specify the title of the image (up to 31 characters).

       -n notefile
	      Specify the note file.  No note is attached to the image by default.

       -c     Produce a compressed image.

       -m     Produce a compressed image if it is smaller than the uncompressed version.  This is the default compression mode.

       -u     Produce an uncompressed image.

       in     The input file.  The default is the standard input.

       out    The output file.	The default is the standard output.

SEE ALSO

       imgvinfo(1), imgvtopnm(1), imgvview(1), pbmtoimgv(1), ppmimgvquant(1), pbm(5), pgm(5).

BUGS

       Bug reports should be sent to Eric A. Howe (mu@trends.net).

LICENSE

       Copyright (C) 1997,1998 Eric A. Howe <http://www.trends.net/~mu>.

       This  program  is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY	WARRANTY;  without  even  the  implied	warranty  of  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You  should  have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

								     Sept 1997							      PGMTOIMGV(1)
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