How to capture 2 consecutive rows when a condition is true ? Post: 302094765

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Top Forums Shell Programming and Scripting How to capture 2 consecutive rows when a condition is true ? Post 302094765 by Raynon on Tuesday 31st of October 2006 08:10:24 PM

10-31-2006

Registered User

Hi, Just notice something. If the input does not contain any 1st field with "c" appending to the number, it will show the below error. Notice also the average value is wrong. I think its because both line for eg 0001 contain "0" in the last field and i suppose it better not to use "0" as the reference point. i use 2nd field "tt=" instead. So i modified the main code to the below.

$1 ~ "^[0-9][0-9]*$" && $2 ~ "tt=" { grp1=grp1+$(NF-1); tot1=tot1+1 }
$1 ~ "^[0-9][0-9]*c$" && $2 ~ "tt=" { grp2=grp2+$(NF-1); tot2=tot2+1 }
END {
printf("Group1\nAverage = %f \n",grp1/tot1);
printf("Group2c\nAverage = %f\n",grp2/tot2)
}

For Example, my input is below

0001 x= 1 $-----.--.-..---.-..----..-.------ 0
0001 tt= 173 358 461 703 907 959 969 1151 1313 1876 2398 0

0002 x= 1 $-----.--.-..---.-..----..-.---------.--. 0
0002 tt= 167 353 455 698 900 952 962 1145 1306 1869 2391 0

Output will have error as shown below

Group1
Average = 2394.500000
nawk: division by zero
input record number 41, file xxx.txt
source line number 5

But how do i modify the above awk code such that when the input contains only one of each type (refering to group 1 or group 2 type only), it will not show any error ?

Thanks

Last edited by Raynon; 10-31-2006 at 09:39 PM..

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ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)