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Full Discussion: Reduce redundant file
Top Forums Shell Programming and Scripting Reduce redundant file Post 302969298 by giuliangiuseppe on Monday 21st of March 2016 08:36:33 AM
Old 03-21-2016
Reduce redundant file
Dear All,
I have to reduce the redundancy of a file that is like this:

Code:
a b 0
a c 0
a f 1
b a 1
b a 0
b c 1
d f 0 
g h 1
f d 1

Basically, this file describe a network with relative nodes and edges.
The nodes are the different letters and the edges are represented by the numbers (in particluar 0, means that the direction of edges is from left to right, 1 is viceversa).


As you may notice, some interaction are duplicates (in bold). For example interaction:

Code:
a b 0
b a 1

a-->b
b<--a

Are exactly the same. The first line interaction go from a to b (0 means inreaction go from left to right), in second line interaction still go from a to b (1 means interaction go from right to left).


What I would like is to filter the file above and output a file like this:

Code:
a b 0
a c 0
a f 1
b a 0
b c 1
d f 0 
g h 1

So, all the duplicated interaction are removed.
!Interactions

Code:
a b 0
b a 0

are not the same! Both go from left to right but is different the starting node.
a-->b
b-->a

Hope is clear.

Best

Giuliano
 

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LEARN ABOUT ULTRIX

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)
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